Nightmare to transfer account ownership

I have a business account with Telkom. When it was initially taken out there was a mistake in the surname of the person who took the account out being displayed on the statements. This was never corrected. I took over the business and have been trying to get Telkom to transfer the account over to me for quite some time now. I have sent through the previous owners ID, but due to the mistake in the surname it does not match the surname on the ID, but the ID number should still match so I do not know why Telkom does not action the transfer to my name. It has really been a nightmare dealing with the Telkom call center. I am constantly told to send a email, but the changes are never made. It's been years now.