finished my invisalign treatment, and now I purchased the vivera retainers (3) , afterward I needed a crown - unfortunately the crown was not made to fit my retainers- the dr. punched a hole in the one retainer for now, I am asking for my retainers to be replaced at no cost to me - they were expensive and the crown was to be made to fit. the dentist is now saying she doesn't think she can do it at no cost? what is my recourse?