extremely poor service and false blacklisting

I have been contacted by Nimble Group informing me i owe them monies for an account i never opened with standard bank called an elite plus current account whereby i only had a credit card with your company took 2-3 months to actually sort that bit out of settling the credit card. in august i have sent an email to "***" however the issue was not addressed after contact nimble group cause i received another email from them today i decided to call them and they informed me of the current account that was sold to them which is a funny cause I've never received any communication from standard bank regarding the current account, all communication received was for a credit card. i have to say the service is extremely poor to be honest, i have never been pushed back and forth than with standard bank and this is why i have never banked with you guys. to be blacklisted for an account one has never opened nor have i received a elite plus current account card to be able to say that I have been banking with standard bank. I will be taking this up with the Ombudsman.