Contract Cancellation Fee

I have recently requested to cancel my contract with MTN but it seems like that is never going to get done. I requested this a few days before the strike and I was told that my request was sent to the cancellation department and an agent will call me within 48 hours. Till now no one has ever called me. I called on the 24/06/2015 and the agent told me that she sent them an e-mail and they would respond to me via e-mail. MTN, please tell me how long does it take to send an e-mail. I am currently not employed and I must cut down on my expenses because I dont want a bad credit record if I fail to pay my debts. Please I need to cancel my contract, I dont have the money to keep it.