Telkom Mobile Contract Cancel(what does it take)

I went to Telkom Menlyn store (ground floor) at the end of Jan 2015 to cancel my month-to-month mobile contract, giving 31 days notice and completing the form instore, to end Feb 2015 since I immigrated to Australia on 1 March 2015. Telkom representative even phoned my and I explained this to him also, now another 2 months gone by and my contract is still not cancelled, I have completed the form again in march and also in April and sent it to Telkom retentions and mobile services to cancel, they have opened a case, but never provide feedback or actually cancel the contract, my bank was now instructed to block the debit orders each month - I need feedback and assurance it is cancelled and all debit orders stopped, I do not know what else to do, Telkom service is the worst I have ever dealt with in my life, PLEASE HELP TO GET THE CONTRACT CANCELLED