Discovery doesn't pay valid claims - Always gives poor excuses

My wife went in for a c-Section on the 29 June. The doctor was outside of the discovery group and we had to pay the doctor upfront in cash and then submit our claim.

I have now submitted my claim 3 times, each time with a different reason for not paying.

Don't bother trying to find a manager, you wait 20 minutes on the phone and no answer.

If the claim comes from savings, they pay easy. This is now from hospital plan now it's a HUGE problem.