Refuse to cancel my account for 3 months now

<p>I attempted to cancel my Telkom account in Feb 2016 as I moved out of the house, they informed me that I would have to wait for my ISP to release the line, in March I attempted to cancel again this time they sent me a confirmation email that the cancelation is in progress. in April I got a deduction, then phoned them and they said the cancelation takes 30 working days and this would be the last month I have to pay. In May I got another deduction this time I reversed it, they phoned me to find out why I am not paying I forwarded them their cancelation email that they sent me and they confirmed my cancelation and sent me another cancelation later by email. Now in June I got another deduction that I reversed again and then they send me a large bill they want me to pay for the months I didn’t even use their service that they had messed up with.</p>