Upset customer of Edgars Store

I have been having endless problems with my Edgars account and the poor service from customer care. I have been receiving numerous sms and calls to say an about is owing yet the account was paid in advance and the balance settled in full. It is the first time in all my years with this store to receive demands of this nature. RCS/Edgars have become daylight ******s and I will have nothing to do with this store going forward. I have made several calls to them as well as emailed them but with no success of resolving this matter.