Edcon incompetency

From 14 June 2018-28 July 2018 Edgars debited my account with Airtime fees. I have no recollection of requesting this Airtime. Numerous letters and phone calls have been made to Edgars Accounts Dept. but to date my account has not refunded. I have been told that a company (RMCS) was the instigator of these debits and I have written to them also but never get a reply. I am continually receiving eMails, texts etc. from Edgars telling me that my instalment is overdue when, in fact, Edgars owes me money! I also cannot get an amended, up to date account from them. I have been a customer of Edgars for the past 40 years and feel that this kind of customer service is unfair and abominably inefficient.