I need your opinions

I have a question that I'd like some opinions on. It's pertaining to my son's school work and his broken wrist. Whenever he first broke his wrist, the teacher stated that since it was his writing arm that was disabled that I could help him out on his homework by copying it to make it legible. No problem. He would work out the problems on a scrap paper and I'd copy them (even if I knew they were the wrong answer) into his workbooks. He has also had an ongoing project this year regarding the 50 States. He has to do a small report on each state that includes the population, state bird, state tree, some interesting facts about the state, etc. I distinctly asked the teacher if it was ok if I helped him on those also since they needed to be nice and neat. And so that he wouldn't get too far behind on them. She said that would be fine. So, each evening when my son got home from school, we would sit down in front of the computer, look up all of these facts for a state and he'd tell me what he wanted written down. We did that each evening for the past 4 weeks. Ok, here comes my dilemma.

Yesterday my son came home from school, practically in tears. When I asked him what was wrong, he said that his teacher was now saying that his 50 state reports hadn't been done by him and that he wasn't going to get credit for them. I called the school to find out what had happened and his teacher told me that she didn't believe that he had done any of the work on the reports because they were too neat! WHAT?!?! I told her that I'd written them up for him after he'd looked things up on the computer and told me what he wanted written down, but that I'd also called and asked her if that was ok. She'd said yes. I told her that he sat right here beside me at the computer each evening and we'd look up the information and he would tell me what he wanted to write down. Her comeback on that was that there was no way he could have finished that many state reports unless I'd been doing them throughout the day for him. Huh? Let's do the math...1 state report each evening for 5 days (we didn't work on weekends) would equal 5 states each week multiplied by 4 weeks would equal 20 states at the end of that period. I think that's entirely possible to do. She argued with me up one side and down the other. I argued back that I have NEVER done either of my kids homework and have always been adamant about them looking things up for themselves instead of coming to mom or dad for a quick answer. She just kept going on and on and then came the words that ended our conversation. "I don't' believe that your son did this work. I think you are lying about it to keep him from getting into trouble" Nobody calls me a liar! If his teacher had been standing in front of me, she would have walked, no make that crawled, away with some major physical damage. I took the high road though and told her that if she didn't believe me that we needed to take it up with the principal.

So, today, I get a call from the principal stating that they were only going to give my son credit on HALF of the reports and the other half he had to redo. When I asked why, the principal told me that his teacher didn't believe that he'd done them and wasn't backing down on that at all so rather then fail him on all of the reports, they came to this compromise. This compromise came between the teacher and the principal. No word from my son or me on the matter was taken into consideration. It was just between those two. There was no arguing with her on this either so I just let it go. I mean, it could have been worse. BUT, in your opinion, what would you have done if you were in this situation?