poor service

my contract expired on April but they kept on debiting I phoned them to cancel the contract and they emailed me the cancelation form I emailed it back but they never respond then I decided to go to the midrand branch i was told that someone will phone me then Bianca called she said I can upgrade using the same number she promised to call me back within a week but she never did i followed up spoke someone from the call center she also promised to send Bianca an email but today when I called the client service Donald said he doesn't see anything in the system am very disappointed on telkom i wouldn't advice anyone to do business with you