3 weeks battle with incorrect invoice

I had a test done on 22/2 at Kloof Hospital Lancet. They advised that I had to pay the procedure myself and claim back from Discovery. The amount was just under R7800.00<br> Payment was made and I submitted my claim to DIscovery on 23/2 with the documents Lancet Kloof provided me. The claim was rejected because Lancet did not give me the correct documents. I had to phone Lancet accounts 2 times to get the invoice. I resubmitted it to Discovery. Discovery AGAIN rejected it as they said the procedure code is not on there. HOW CAN LANCET NOT INCLUDE PROCEDURE CODES ON INVOICES IF THEY KNOW THAT IS THE STANDARD REQUIREMENT? I phoned the branch and spoke to REGINA who seems to be the manager. All she could send me was the paper document I filled in the day and she said the procedure code was on there, but if discovery rejected it I should let her know and she would phone them. I resubmitted it 11/03 and AGAIN it was rejected as they say the procedure code is 4 or 5 digits... not ICD etc! I have emailed Regina but she is on training until Wednesday. I am not willing to wait another 3 or 4 days.... I want my money and assistance now!!! Worst company I've dealt with recently!!