Worst Service provider!!!!!!!

One start is overreacting!!!!!! It's suppose to be a -0. I have trying a week to cancel my contract sim.!! I did follow all instructions and I paid the settlement amount it reflected in their account last week already! I keep phoning going through the whole proses and then all of a sudden there is no service and the advisor cant hear me!! I have the name and the date and times to whom i spoke to! So i would formally lodge a-compliant against the advisors who is spiteful and doesn't to work! Its after all a telecommunications company so to get the call recordings wont be an issue. I am so fed up with MTN service !!!!!!!!!!! I just want to cancel the damh thing but we cant do it at a store oh no please phone 135!!!!!!!!!! Phoning 135 is useless rather let the people working in your store do the work! Because your service is worst than the store!!!!!!!!!!!!!