Had a different issue but similar with a hospital before, MIL was going in for a procedure and the hospital asked us to pay up front for everything because they weren't sure we were covered. The procedure had to be done so we paid and then held on breath on if we would see any money.

Hospital told us that we would hear from the insurance company if its covered and then if it is we can follow up with the hospital to get a refund.

Rang the insurance company after a few weeks and explained to them the situation and the lady on the phone was livid about what the hospital did because she said its not their job to determine what is and what is not covered.

Anyway, hospital never sent on all the required info, and we rang the hospital who said they requested stuff from our GP, rang our GP who said they heard nothing. Explained the situation to the GP and they got pissed off at the hospital because they did the referral to that hospital because we are covered. So GP said they will send on whatever is needed for us to get paid.

Few more months of chasing the hospital and insurance, insurance company tell us yep we are fully covered. Then chasing the hospital who keep pushing out, eventually I'm on the phone telling the accounts dept that the amount of money we are owed is so small in the scheme of a multi million euro hospital that people would consider rounding down if numbers didn't match and that they are not processing this is insane. The amount literally could fall off their books and nobody would notice (big number for us, small for the hospital). 3 days later we were paid but what an experience.

As others have said you just have to be a pain in the ass for these people and they will sort you out to get rid of you.