Incorrect billing

I have had my account with edgars for more than 15years and never had problems with my account billing under Edcon. Eversince RCS took over l have been charged ridiculous amounts and interests. When RCS took over edcon accounts l was informed that there will be no changes on the account. My account is a 6 months account without interest. Since January 2021 to date I have been charged for more than l spent and I am even afraid to use the account. I have tried contacting RCS client services without success, my 01st straw was in August where I was informed that the matter was escalated to their accounts department. Followed up again in September where I spoke to a very rude agent who advised that the credits have been passed on their system back end and will be available on my October statement. To my surprise no credits have been passed on my account instead I have been charged extra by almost R300. Today I went to Edgars Westgate in Roodepoort to try and get a better understanding on my account however the attempt fell on deaf ears as the store no longer have a system to check customers accounts at store level and calls to client services were dropped twice. I would like to be provided with my account reckon from January to date and failure to have the matter resolved will leave me no choice however to close the account as this is a torture to my finances. I would rather take my business where l will be taken serious or my rights not violated as a paying customer.