Poor customer service

About 3 weeks ago I sent an email to Edgars customer service in regards to my account that I closed in 2018 but it suddenly resurfaced. They requested my contact details and was informed that they will give my information to RCS as they are incharge of Edgars now but even now I have not received any response or feedback in regards to my request for the account to be closed. Instead I'm still getting sms's threatening that legal action against me will be taken if I do not pay the account. I was retrenchment in 2018 and all required documents were submitted , however I got a phone call to say I'm owing R410 I asked the consultant what for as I thought the account was closed. It's been over 2 years now. Edgar's is ruining my name for nothing all because they failed to close the account now it's actually increasing every month interest is being charged.