Should I try to dispute the charge with my bank if paid DMD for retainers, have not received them and office keeps dodging?

I paid a little over $2500.00 to a dentist for retainers in March of this year. I was to receive them in May, yet still have not. I have been calling the office since June, and each time the office manager tells me she will call me back, which she has never done. Each week I call back and there is another excuse with the promise to call me back. Last week, I told her that I would like a refund, faxed her a copy of my receipt, and once again she said she would call me back, which she did not do. Is there a board I can report the dentist to? Should I sue?