Mtn 's stinking poor service

I have not been able to make any outgoing calls from my phone since migrating on the 8 of September. I am beyond fed up. I have send countless emails , called everyday to lodge query, i have been to local Mtn store as well. I have to keep paying but without having any services rendered. !!!! They keep suspending my children' s phones that are connected to my profile as well!!! I am at my wits end about what i am suppose to do!!! Their service stinks to high heaven. Can i drag them to the ombudsman? And which one must i use????