NO FEEDBACK OR ANSWERS

I have an issue with an account from lancet that should be paid however the incorrect ICD10 codes were used and a minimal amount was paid. Discovery then advised that they will manually change the information and have the claim reviewed. It has now been 3 weeks. I am still waiting for feedback. I have called 3 times and I am always told someone will call me back but I hear nothing. The latest was on Friday. It is now Tuesday and again I was the one to call back. Discovery is refusing to provide a turn over time or confirm if I pay the account will I be reimbursed by Discovery. I get told they are not sure and cannot confirm what will happen if I pay the account and the claim is also processed to the service provider. In the interim I have now been told by lancet the payment is overdue. I need some sort of answers. I cannot be handed over for an account that will be paid by Discovery while Discovery refuses to provide me with feedback. This is ridiculous service