MTN Softlocked a paid line

mtn has softolocked a lines that i have paid for on the the 28th Feb 2015. i have written several email, they just read and never respond. their service is so bad that i wish i could cancel my contract today. its such an inconvinience to pay for something then when you have to use it its softlocked and the service provider has such a bad attitude. i still say when it comes to cellphones Vodacom will remain number 1 becasue they know how to retain their customers. come end of term i dont want anything i just want to cancel those contracts becasue this is the 2nd time that i am being inconvinienced this time around its worse because its been days since my lines have been off