RCS charging me for a CREDIT BALANCE????

I have been begging Makro/RCS since 4 February to provide me with a settlement amount on my card, I eventually decided to pay the amount outstanding on my statement. Today - 28 FEBRUARY - 24 DAYS after I started begging, I receive an e-mail casually apologising for the delay, telling me that I have a credit balance and I will be charged a monthly service fee for the credit balance unless I provide them with a bank letter, my ID and probably my DNA profile too!!! How on earth do you justify ignoring me for 24 DAYS and then having the audacity (at month end) to threaten me with another charge????????? If I am charged one single cent for a CREDIT BALANCE due to your INABILITY to perform your duties, I will report RCS to the National Consumer Commission and any other %$! commission I can find. CLOSE MY ACCOUNT - take the money that is in credit, I don't care, I am NOT trusting such an inept bunch of people with my bank letter or ID copy. You granted me credit in 2 hours, now it takes more than a month to get this account closed??? Bite me!!!