Telkom does not want to cancel my account

I am receiving accounts for a services which I have not authorized.

Two young men, claiming to be agents from telkom came to my office to promote a new wireless system in November 2018.

They were very persistent and even sent a technician to come and install equipment. We asked the technician to disconnect what he was doing and he removed all the equipment.

I am now receiving invoices from telkom and the monies is being debited from my account. I have sent numerous emails to cancel my account with them but to no avail.

I have been in to the store and they told me the account has been cancelled but it is October 2019 now and my account is still being debited.

Telkom has also listed me as a bad payer and I can not get a home loan now.