Supersonic are *******s

Changed my FLTE Line to a fibre line in February, was told to send d through a cancellation request for the FLTE Line and I did so on the 8th Of Feb 23 bit recieved no response. Got a statement at the end of March which now has a charge for 2 fibre lines and 1 FLTE Line. Before my account could be debited I called to query and was told by Zanele that I shouldn't worry about the FLTE account because it has been credited...on the 1st of April I got debited R998 for a FLTE Line which is not in use....after numerous calls made to supersonic and being pushed from 1 side to the other I still haven't been refunded and the only thing I can get out of them is a case number and when you query it you get told it's still in progress....I mean how do they work because this 8s the second time this is happening to me