In my experience worst mobile provider

I have been trying for a month now to port my MTN number to my new Telkom comtract and it still hasnt happened. There doesnt appear to be a prompt on their 081180 number. I went into their Stellenbosch office and placed order. The consultant phoned back following day. I phoned my contact Verny at MTN and she said there shouldnt be a problem at all and gave contact number which I gave to Telkom consultant, that was 2 weeks ago. I have been phoning numerous call centres of Telkom to no avail. Do I have the right to cancel my contract due to no service?