*****'s, lairs, incompetence and a lack of customer service

I've cancelled my telkom landline on the 5th of April, and have received a call on the 5th of May to confirm my cancellation. I also received a email regarding it. It's the month of November and i'm still getting billed for the line, even tho the line has been cancelled and no longer in working condition. I've kept on paying. Please sort out your billing and refund me as the line ********** has been cancelled in MAY 2018 already.