Refusal to cancel account

I joined Netstar many years ago, and in January 2013, I joined Discovery Insure, which provides tracker for its customers. I informed Netstar, in February 2013 and requested cancellation of contract by email and got an automated acknowledgment of receipt only. In May 2013, I informed Netstar that I am not prepared to pay debit orders and insisted on cancellation of the account, explaining very clearly that I have joined Discovery. They eventually cancelled the account in September 2013. I then requested that I be refunded all the monthly deductions that were taken since February. I was explicitly told that I should settle the R1,672 and the company will then see how they refund the entire amount, the reason that I was given is that, at that moment, it showed arrears and it may be difficult to close and do the refund. To my surprise, they started billing me again, and in February 2014, I sent an email again requesting cancellation of account and still only got an automated reply. I then instructed my bank to reverse all transactions. A debit order was sent again yesterday. There were many calls to Netstar to Nomsa Cindi, Farina, Natisha, Hazel, etc. No one is prepared to cancel acc