Arm twisted to keep contract

my contract with telkom mobile was expiring mid march 2015 and i did not wish to renew my contract so i went to the telkom mobile store to cancel the contract only to be told that i was owing them and cant cancel the contract until i pay what i was owing however this was not true as i had cleared my bills with them so i phoned 180 and they promised me the suspension status will be removed within 48 hours but that never happened as my visits to the cresta telkom mobile store were fruitless as my number was still suspended on their system ,whilst i was in the store and i phoned 180 and a customer service agent confirmed i was not owing them so i gave telkom mobile cresta guy the phone so that he can get an explanation from the 180 agent . at the end the cresta guy logged a case so that the suspension status be removed and i can be able to cancel my contract<br> on the 1st of April telkom mobile gave me minutes to use and they are demanding payment or they will blacklist me according to their customer service agent<br> i have been trying to cancel the contract since march 2015 and their system would not let me , now they are trying to force me to pay for what i did not need.