Lancet admits they owe a refund but refuses to pay

On the 14th August we received an invoice that we had an outstanding account of R 11130.29 not paid by Medical Aid that I was liable for. I then settled the account and resubmitted the documents to Medical Aid to confirm why it was not settled. Medical Aid then confirm that the account was settled and that nothing was due to Lancet from both the Medical Aid nor Myself. On the 16th September we called Lancet where they confirmed that there is indeed a credit on the account for the above that would need to be refunded. Since then we have been back and forth with Lancet trying to get the refund processed. We tried phoning numerous times a week with no success, sent emails which take no less than 15 business days to be rep**** to with more requests or excuses as to why it has not yet been processed. This has become beyond a joke.