Standard Bank Home loan Department harassing wrong person and refuse assistance

I've been having constant problems with Standard bank contacting me for a Home loan which is no longer in my name and has not been for more than 5 years. I keep on getting messages on my cell number and calls from the bank and attorneys. I've supp**** the Bank with the correct contact details of the owner of the Home loan. They even have my home address and phone number on communication. The current owner of the loan refuses to change the details at the bank as the home loan has been in arrears since July 2019. I've supp**** Standard bank with proof that the loan is not in my name and the correct contact details for the owner of the loan but they refuse to assist. When contacting Standard bank they say my number does not appear on their system yet I keep on getting calls about the arrears amount and messages