Should I be reimbursed for overpayment?

Signed contract for surgeon, surgical facility, anesthesiologist. Surgeon paid directly for his time and independent facility I paid anesthesiologist directly. Anesthesiologist notified that charges were less than quoted (less time used). Received facility bill which was approximately $500 less than I paid. I asked for $500 reimbursement from surgeon who refused to reimburse. Should I be reimbursed difference between what I paid the surgeon and what he was charged. No insurance involved.

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