More than 2 months and Plan still not Cancelled

After more than two months of emails and calls back and forth to Discovery Health to cancel my Gap Policy and to remove me and my wife as dependants on the medical aid they still done nothing and worst of all they are billing me for this. I am now lodging a complaint with the Medical Schemes of South Africa as this seems like the only way to get this resolved barring taking legal action against Discovery which at this point I am willing to do