Telkom is terrible -*******ly billed

reference ***6. I cancelled my Telkom line on 23 January 2020 and I have sent two follow ups and been billed up to end May 2020 still, why am I being billed for an additional 3 months now after I should not have to be paying, with the 30 day mandatory period it should have been cancelled on 22 February, I’ve been billed for March, April and May!!! I can not afford to pay for this and it’s something I should not be paying for. No feedback after escalating this matter to the complaints department - received an email saying id get a call within 48 hours and no call!