Have the front 2 legs of the cat amputated.
I had a cat who did this. It was just a game for him. So instead of having the roll properly on the dispenser, I just sat it on there vertically. I'd often walk in to find the roll on the floor. Sometimes with huge bite marks taken out of it. I'd just carry his fluff ball butt in there and scold him. After maybe 5-7 times of doing this, he stopped completely and I was able to hang the toilet paper rolls properly.
This thread's a year old but maybe others can pull some helpful advice from it.