Desperate to dump telkom

Upgraded adsl to fiber and is the biggest mistake ever. Telkom has no idea what they doing and customers suffer. They could not even assist me to cancel the upgrade but are happily sending me invoices for a non existent service (old and new line now does not work). Pathetic. No longer want any service from telkom. Can I please just get someone to cancel the service. Website does not allow me and not even the contact centre (billing) are able to find the cancel service request on my profile. So just have to keep paying for nothing.