Debt collectors letter after cancelled my account

Here's what happened:<br> -29-30 November 2014 - I phoned to cancel my account because we were moving house. They said I'll have to go into a branch to cancel.<br> -1 December 2014 - I went into Eastgate telkom branch, filled in a form for cancellation. The guy told me my last bill will only arrive mid January.<br> -11 January 205 I got the bill and paid it.<br> - February 2015 I got a bill again, I phoned them, they said it looks like a mistake they'll fix it.<br> - From March to November 2015 I haven't received a bill again so I assumed everything was sorted out.<br> - 6 November I get a message from debt collectors saying I owe Telkom R1345.66<br> - 6 November I phoned Telkom, they gave me a reference number and said someone will phone me back shortly.<br> - It's now almost a month later, I haven't heard a thing from Telkom, the debt collectors want to blacklist me.<br> - Tried to phone today (3 December) but I'm on hold for so long that my airtime runs out.<br> <br> Telkom's service has always been so disappointing! (There we go. no swear words. yet)