Account/Charges Dispute

I have sent numerous e-mails to edg******* to query the interest being charged on my account but no response/explanation has been provided. The last purchase on my account was in July 2020 which was prior to RCS deciding to introduce interest on all purchases. By signing when the purchase was made, I agreed to a 6-month interest free payment for the purchase. My August 2020 statement also clearly states that the purchase was made on the 6 months interest free plan. In addition to this, my account is not arrears. SO PLEASE EXPALIN WHAT THE REASON FOR INTEREST BEING CHARGED IS??? The second issue is that the October 2020 statement reflects a closing balance of R3 818,79. However, if you take into account the opening balance of R4 283,30, subtract the payment and add the various policies (personal/parent funeral plan, etc,) and add the interest (which is being disputed), the closing balance should be R3 804,28 and NOT R3 818,79. After having my Edgars account for approximately 20 years, I am very disappointed with the service, or lack thereof, that I have received since RCS has “taken over” Edgars!!!