Rcs store card

I have an store card with Rcs. Feb month i settled the account and requested the card/ account be closed. Then afterwards i received a statement indicating ********** transactions. I reported and the balance was reversed. But ever since rcs calls me stating i again owe money due to admin costs and i have send e mails and made numerious calls to no avail to get the card and account closed. Im fed up beyond measures. How can rcs consultants not even answer calls. And yet u get called by collections dept and they cant resolve the matter. I feel rcs is the worst financial institude i ever dealt with.