I can't cancel my contract

I have been trying to cancel my Fibre line for almost 2 months with absolutely no success. I have copies of emails I sent to various Telkom consultants requesting this, and I have a copy of an email from another consultant requesting my Fibre be cancelled to his supervisor, but a month later, my account is still active and I am still incurring an R800 bill every month. Due to Telkom's inefficiencies, it is costing me R800 every month!! When I email these consultants - they don't respond. I don't know what to do anymore.