my contract has expired, im cancelling

my contract has expired and i have been calling the Telkom Mobile / 8ta for the cancellation until now they did not cancel the contract <br> <br> i have send them cancellation form with a Certified copy of my Identity document but no cancellation has been effected by Telkom Mobile / 8ta.<br> <br> when i contact them on the call center they say that there is no Number for Cancellation Department .<br> <br>