Cancellation

I opened a Data contract from 2011 until current never faulting on my payment- I went to the Glen Telkom store on the 22/01/2015 to cancel the contract as it had expired, left a letter, I then cancelled the debit order.<br> On the 14/02/2015 my banking account was debited with R439.00 from a company called Nu Debt with our my authority and I reversed the debit order and contact them to be told to call Telkom which I did ,the call centre agent Zama advise that I go back to the store and talk to them..<br> <br> Not impressed as I have done this and know I need to go a second time .<br> I did not even receive a call from Telkom before they handed the account over , however every month I receive a call from sales to renew my contract.!!!!!!