LANCET worst services ever!!!

I have wrote at least 6 emails, phone lancet 4 times and still no Response from the manager who promised to phone me back on Monday23rd Feb who didn't. Donald Mphela has no clue how to answer. Lancet billed incorrectly on code 01901 which is a out of hospital consultation, while i was inhopstial. they refuse to rectify this and Donald says the medical aid must supply a code! Never in my life did a medical aid supply a code to a supplier!! They refuse to correct the code as they have no clue how to bill for in hospital for a drug that was used from Austria that is not in SA. They DO NOT reply to emails at all. they call centre agents have no clue what is going on when you phone them and different agent answer and cant help you. LANCET has the worst services ever. How do I Escalate LANCET further? The medical aid has advised them it is the incorrect code and they must submit the correct code. they still haven't done so in over 3 weeks. Last year LANCET ****** for for R385 they double charged my medical aid and i got tired of the emails and phone calls and they did not rectify it at all.