Still being billed for an old line TELKOM PATHETIC

I moved house in Dec 2018 and gave Telkom more than a month notice in Oct 2018 to cancel my adsl and landline. We are now on 16 July 2019 and i still received an invoice for my old address. To add fuel to the fire, I've now also received a double invoice for my new Fibre account with Telkom. Clearly this is breach of contract. I've been promised multiple times that the old line has been cancelled, yet, the invoices still keep rolling and rolling in. My invoice should be straight R805 for the fibre line and not a cent more than that. I've used twitter, facebook and telephony to make contact with telkom to resolve this issue, but to no avail. Putrid, Pathetic, non-existent service.