The worst service trying to cancel an ADSL

Good day, i sent a form to ********** to cancel the adsl on the 15 November 2017 of which i received confirmation at the end of November that it had been cancelled, but it still being billed on the statement. I queried again on the 29 Jan 2018 and I was advised to send the cancellation form to ********** which I did. still i got no joy and on the 16 feb I had to resend the cancellation form again and a lady by the name of lebo on your facebook page confirmed that the form was received and the cancellation was processed. a dispute was also logged the 16/02/2016 ref ********** 6. I have since received no feed about my dispute and when i spoke to an agent this morning they say that the adsl line has not been cancelled. at the moment my landline has been cut and im highly frustrated because no one can help me. On the 4 May 2018 i was asked to send the i.c and cancellation form through again and it was going to be escalated to the retention section. till today im still awaiting feedback and i received a statement yesterday still showing that it has been billed.