Sarah we have the same here, it's infuriating. I'd go back to the reins and if he objects use them as a bargaining tool, if he wants them off he has to be good. Will always has his on and I tuck the loop up when he's being good. We had the naughty stool, but he laughs and takes himself there!! Not sure what to suggest, we have good days and bad days think it's just the age. I got fed up of constantly shouting and felt bad.