CHANGE CONTACT DETAILS - Receiving messages & phone calls not meant for me.

I keep receiving messages for an outstanding home loan payment that are not meant for me as I do not bank with Standard Bank. I have phoned the Standard Bank call centre 4 times & the home loans department MULTIPLE times to complain but this issue is never resolved. I have also submitted a complaint on the online portal for the Complaint Resolution Centre and also email the Complaint Resolution Centre but I have had no feedback from Standard Bank in any form.

My work cell number ( ********** 380) is listed as the contact number for someone who has not worked at this company or used this cell number for 5 years. Since he still has a home loan with Standard Bank, I cannot understand why Standard Bank does not have his updated contact number. I get multiple calls every week & I receive 2 or 3 text messages everyday for a home loan that is his & not mine. Why can this number not be removed & updated to his number?