very unhappy customer

Cancelled a line in November 2017 but I am still getting billed for it I called numerous times was at first ask to resend cancellation forms which was done 3 times every month i am getting billed for a line i do not have when i call over and over i get no help at all. I was told it will be sorted and cleared in 24 hours months have gone and no such thing happened every call I made i get no help no one in telkom can assist and sort this out however every moth they can bill me