Very upset

I'm not usually someone to complain but I'm Very upset with Ampath, I saw another person complaining about the same problem I'm currently experiencing with Ampath. I went for antenatal screening and tests on the 13th of December 2021, the lab used general test codes instead of pregnancy related codes to place a claim to my medical aid and now the medical aid didn't cover the tests. I've started phoning my medical aid and Ampath accounts department since I've realised the issue but every time I make a call somebody tell me something different. I've made so many calls back and forth between the medical aid and the lab and still I'm not getting anywhere. The medical aid sent the claim for a review and requested that Ampath should fix the codes, but Ampath didn't accept any codes from me as a patient given to me by my medical aid and the Dr's rooms. The last person I spoke to at the medical aid said I should ask my Dr to write a motivation letter with the proper codes and fill in a new blood ordering form with the codes included for the lab in order for the lab to reprocess my tests and account, I've asked my Dr's rooms to do this since I'm desperate for this to get resolved, they also informed me I'm not the first to complain about this and they will see what they can do to help. I've received and email with my account now and an sms with the amount to be paid before 60 days otherwise I'll receive threatening letters, all the while I'm struggling to just get someone to help me with the proper procedures how to fix the problem since the wrong codes was claimed for by Ampath. Two years ago I had more or less the same tests done by another lab also for pregnancy antenatal tests and I didn't have any problems like this.