STANDARD BANK CREDIT CARD

I was contacted by Standard Bank to inform me that they have not received my July payment. The payment was however made and I sent them my bank statement reflecting that the EFT payment was made. I am struggling for a week now to get them to correct my account, sent daily emails and still have not received feedback on the correction. Now I received a text message informing me that my credit card will be suspended. Standard Bank, after been with you for over 30 years I am now being treated as a ********, I can't wait to close my account with you. Extremely unprofessional.