1st ask yourself if you are involved in a martial arts gym or a "Martial Cult" The reason I ask is that you were injured and assisting in a competition and had to pay to teach kids. Once you ask this of yourself then I will say the next thing.
I have trained under the best, people who are recognized by countries as living treasures and never have I had a qualified instructor injure me (other students yes but not the instructor). I have also taught on my own for over 10 year and have never injured a student. It is my opinion that if an instructor accidentally injured a student during training that requires time off of training, it show that he is not as good as you want to believe.
I would tell you to consider looking for another club
Well first off sometimes freak accidents happen and people do get injured so I think you have to at least look at that aspect and what happened and how you got injured. I have seen a fighter get a broken nose for instance while wearing a full face head gear which normally does not happen. So consider the circumstances and if others seem to get hurt or injured a lot is what I say about that. As for them caring or not caring there are all types of coaches and trainers and not all do a good job of following up with students and fighters. A good one normally will though.
The thing about paying would irritate me also especially if others got in free who had been there less longer then myself and/or helping out less. As I see it you have to balance these things against what else is available out there for you to go to I think as well as how happy or unhappy you are at the current place you train. You might mention to the instructor that you had to pay while others didn't and maybe can get credit towards your gym and lesson fees for that thereby getting some satisfaction and respite for all this and the course of action I would follow I think. Depending on his reaction and based on everything else then I would be more apt to make a decision about all this if it was me.
Jessica i was in a similiar situation( but with muay thai) my sensei left the school to start his own but when he left everything changed in my current school they didnt follow traditional methods to the martial art and was very sloppy with technique and even skipped classes and we were sitting there like what?? So i decided to try my past sensei's new school turns out he only cared about makin money not the students or the martial art anymore so i quite and after a while found a new school that actually cares about how u proggress and works for u... So needless to say maybe that school isnt for u and theres another school that would b better for u
I too got injured at the school where I trained and my school treated me like crap. A teacher from another school took me in trained me, stuck with me during my surgery and finally even helped me with my physical therapy when my professional physical therapy ran out. I believe that it is thanks to the instructor that I can still do martial art since professional therapy only gets you walking again but martial arts covers a huge range of motion, not just walking. After I was well I went back to the original school since it taught the style I trained in for many years and the other teacher really did not. Bottom line, they still treated me like crap and were ruder than ever. Nothing ever changed and I gave up. I am still with my teacher who treated me well. I am not as good at that martial art as I was at the other one because it is a much more complex martial art but I still practice my old martial art and the new one really has made my old martial art better. So it is all good.
As for you unless the training is worth it for you to put up with crap I wouldn't go back. If you decide to go back you need to just train, put up with the crap and shut up. The training better be awful good for someone to put up with such things. If it was me I would find another teacher and even another martial art if necessary. Noone really deserves this and generally you should really think more of yourself than to put up with it. Talking to those guys is pointless as 99% of the time things do not change.
If you want to go back, just go and don't make a big deal of it. If not. perhaps you could train at a different club? Or maybe even a different martial art?
Ive done kickboxing for well over 3 yrs an have been off due to injury. I feel like my kickboxing club dont care about my injury which pissed me off an made me feel like I didn't want to train with them again (injury was an accident but was caused by my instructor) I don't know weather to go back. Its not just the injury theres other things like we held a competition an everyone helped out an got in for free yet I was helping train the kid's an had to pay, that got me mad n felt like quitting. I just don't know what to do as I did enjoy it. I got great technique an they taught me that. please tell me what to do