How and can I can get out of paying this monthly fee when services were not effective?

I was financed $8000 for Laser cosmetic procedures that melts fat. It was an 8 week process and I was told that after 8 months I will see the results and to come back. I did not see the results and I gained 10lbs. When I returned I was told to lose 10lbs.?? I lost 12lbs and contact the doctor and have not heard from them.

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