Dysport in the masseter not working

I have a really strong jaw and have always had issues with clenching. This gave me really strong masseter muscles and a more square shaped face. I have been getting disport in my jaw for over a year now. I get about 60 units on each side and have had that done about 6 times. I still have so much movement with the muscle when I bite down, and I don’t think I’ve seen a change physically or pain-wise. It still hurts when I smile a lot. I’ve tried 2 experienced providers and I’m just confused.