Why Does my Tooth Still Hurt After a Filling After Having Three Bite Adjustments?

Hello, I had three composite fillings on the upper righthand side of my mouth on August 15th. A few days later I experienced a sharp pain while eating. I called the dentist, and they explained it's most likely a bite adjustment. I went in and had it done, but that night had pain while eating. Went back again, still had pain eating. On the third appt. on 9/9, he shaved down "as much as he could" and said he couldn't shave down any more. Well, I'm STILL having pain while eating. Is this normal?