Lancet mistakes

Lancet customer services are the worsted I ever experience. Lancet made a mistake with dependent code claim on the wrong independent code, my medical paid on the wrong dependent code and one test was not paid they said the must resubmit the claim with the correct dependent code and give the code to use for the one was rejected! I try to resolve this several time telephonically and emails from the 9 July my last email I send was on the 17 July to call centre, service and the lady was help me but no success. They can have look at their server and recordings. All documents was send but the keep on going sending me sms and mail I must pay in 7 days! I think they don’t know how to resubmit because they receive payment really! I will see it on my side if they did resubmit but up today they did not! They put the patient under unnecessary stress because of their mistakes. I told one lady I willing to pay R10 a mount because this is not my fault it theirs! She telling me the lowest R150 that means I must pay in two months. Their mistake now demanding how to must to the payment.