MTN WI-FI service.

I took out a monthly WIFI deal with MTN, 2 months ago for just over R600 to receive the rooter and then R400 per month. The rooter lasted not even 24 hrs when it stopped functioning. I took to the nearest MTN branch as per MTN instructions which could not or did not want to help me. I then went to a satellite MTN shop in the same shopping center. They do not do WIFI services but sent me to another branch in a shopping center 8km further. That branch could not understand why the first branch did not help me but after they told me the rooter have to be send in for repair which will take about 2 week's hopefully. I could not go without WIFI for 2 weeks hopefully and then asked that the contract must be canceled. It took the branch about 1.5 hrs to fill in about 5 forms and I had to sign every one. After that MTN deducted R325 from my account which I returned and stopped them from doing again. Since then they keep on sending me letters to pay my account or they will stop all cell phone services to me which up to now did not happen. After 3 emails to them giving them all the data, they just keep on sending me the same letter. I refuse to pay them any more money after the bad service that I received and actually think that they should refund me part of my R600 that I had to pay for the lone rooter.