Shocking service for pre-approved surgery

After my father received a pre-approval for a shoulder operation that took almost 3 months to get approval for, we are now sitting 6 months later for the surgeon to still be paid!!!! All numbers and information are correct and let me say again -IT WAS PRE APPROVED!!!!! Numerous phone calls and still no payment through. We are no facing legal action and still holding on for people who never help or bother to return emails or phone calls. Funnily enough it doesn't take any time at all to take my parent's money each month and they've been members with them for over 30 years! SHOCKING SHOCKING SHOCKING SERVICE - sorry, no service at all!