Contract expired in Dec can not get it cancelled

Since Jan 2015 I have been trying to cancel my contract with MTN which expired in Dec. I had no joy with online MTN so I approach the Hoedspruit Branch - Firstly I was told the only way to do it is to phone. When I said that I have tried unsuccessfully, the MNT employee said she can do it and asked for my phone as they can not call out. I was desperate and gave her my phone. After half and hour I had to leave - no success. On my return I ask KYLE to assist me. Month after month only to discover via an Nelspruit employee Jaque Oosthuizen that the Hoedspruit branch employees actually do not Know how to cancel a contract.. Jaques says that he cancelled it but can not confirm it because MTN is on strike. I inquired with Kyle to confirm cancellation and he also said that MTN is on strike. So both Kyle and Jaques are unable to help me either due to lack of training or lack of interest. or MTN being on strike. Lots of people are furious with MTN Hoedspruit.