Harrassment by FNB and Ts legal

I am being harassed by lawyers for FNB about an overdue credit card which is not mine but for Mr Jan J Storbeck, I have tried to tell the lawyers from Ts legal that the account is not mine but they insist that its mine. I have been receiving mails and phone calls, one of the mail says i quote "We refer to the handed over account by FNB CREDIT CARD account ***. Which is due in arrears of R133443.80,Kindly pay amount R 39494 to be able to use your credit card again. The account is not mine, my account is *** and I only owe you R32000. I tried calling FNB to sort out the matter but it looks like they are not willing to sort it out because I'm still receiving messages and calls I'm still being harassed for an account that is not mine. We are stressed about the coronavirus and now you are adding another stress to me about an account that I don't know of. My id no is *** and my contacts are *** / ***