Unauthorised billing to my account

I have paid up my account in January. In March I used my points and credit amount that I paid to much on my account and made a purchase. Balance of purchase was paid in April. I have taken out the funeral policy on my account a long time ago already and knew about that being debited to my account. I received calls since last month that my account is in arrears, I requested statements 2 times and did not get it. Phoned customer service and requested again, to my shock my account is over R400 and there is a VIP membership and some SMS Air subscriptions debited on my account which I have not authorised!! i was even charged interest on the arrears amount! According to my calculations Edgars is owing me R48.61, but they are telling me I owe them R419.06, and they are giving false information to the credit bureau as I am not owing them or are in arrears. I want this fixed immediately and my credit record rectified!!!