Pathetic service/wrongful itc listing

Most pathetic company i have come across i hold two credit cards with them both being rcs platinum card and sanlam money saver credit card my repayments where up to date on these accounts timeoulsy without a month in arrears and then rcs decides to change bank details to where we supposed to make payments not notifying us until the very end thou and then updates on itc that we are 30 days in arrears after holding a good credit history with all my other accounts for many years if my itc is not rectified as it is not my fault that we was notified late of bank details changed even thou we had already made payments there for the months stipulated as arrears if my itc is not updated accordingly or a letter is not issued with clearance of the months for arrears I will legally be taking this further.