Procedure Incorrectly Coded - 10 days not fixed

Invoice V*** On 03/02/15 my husband went for a test at Lancet. Even though we have a medical aid, we were informed by Lancet that we need to pay cash upfront, and claim the amount back from our Medical Aid. I've submitted the claim to my medical aid, after waiting 6 days for my invoice from Lancet. On 20/02/15, Medshield informed me that they cannot finalise the claim, because the test was incorrectly coded on the Invoice by Lancet as 9999 - a code that does not exist. The code and description of the test must match for Medshield to process the claim. On 23/02/15 I forwarded the email from Medshield, with the Invoice and cash receipt, and requested that they correct the code on the invoice in order for my claim to be finalised to accounts. After no response from Lancet, I phoned the call centre on 27/02/15 and forwarded the mail to them. On 03/03/15, I received a mail to inform me that my request will be forwarded to the correct department for resolution. I phoned the call centre this morning to enquire on the progress and was informed that it might take \another week or so"to change the code. This is unacceptable - I want this invoice to be correctly coded"