Switching Invisalign provider

I paid in full for my Invisalign treatment (included free refinements)I completed my treatment and I am up to the refinement stage . This experience has been a distaster for me , especially that I have never seen the doctor who prescribes the prescription . Since , I paid in full , may I be able to do so and do u have to pay the old Doctor any fees if he has prepared refinements I did not approve since I was on vacation?

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