My dentist overcharged me by 2,000

I paid my dentist up front for work that I needed, so !when I needed more work, I asked for my money back,, so he sent me a check , he kept almost 4.000.00 what he did was take out a bride and make me a temporary one, he dcharged ne 2400.00 for this bridge! I asked my in network dentist how much it would be ,he said 400 to 500.dollars, I was overcharged for this temporary bridge that had to be fixed twice!! Can I do something about this? Thanks Pat