So tired of it

the crap doesnt stop Im being ripped off by the dentist. Paid for two night splints that I wear over my teeth to ease the pressure of grinding my teeth. they didnt and still dont fit. the dentist made me another that did fit , ( she says she made it for free). That one hasnt lasted but a couple of months and has snapped. made me another she charged me 200.00 for it If I refuse she could sue me. I fear going anywhere for another one incase of the same issue. I need a night splint , grinding my teeth causes migraines.