Dr. Dental- Cambridge

I initially had a $209 monthly payment through *** for restorative services from Dr. Dental. After an additional procedure, a Dr. Dental representative arranged an extension to the time period over which the payments would be made to keep the payments at $209/month. Instead, *** started charging $267/month. Thus far, I have paid this higher rate, which I did not agree to, for two months, and I have been unable to get it changed by repeated calls and visits in person to Dr. Dental.