MTN no customer service

I've been a MTN customer for more than 10 years and never had I such bad service as the last 6 months. For the last 4 years I've been working overseas for 6 months at a time. Every time I come back I carry on to use my number.This year Feb I came back and was due for a upgrade. I recieved my new phone but is unable to receive calls and sms. With a message of 'the number does not exist'. With the result I can't install any apps on my phone because I need to receive confirmation sms to install eg.Whatsapp and banking. I went in store to report it but I had to leave again for work overseas before the matter was resolved. I emailed the consultant I dealt with but with no success. I arrived back in the country in June and took the matter up again. Every month I receive an account from MTN and it gets paid but I can't use the full service I'm paying for. I've been in and out the store to resolve this matter for the past 2 months since I've been back. The consultant traced my number to originally be a Vergin mobile number and that the number was 'sent back' to them. We have been trying to activate it on MTN again but no success. The last option was to give me a new number. This I did with the consultant more than a week ago and still I haven't recieved I new number. The consultant is passing the buck now that's it's not her problem anymore and I should phone 135. I've been phoning but I can't find any option to speak to a consultant to receive a reference number. I am at my wits end. I want a reference number to take this matter further with the Ombudsman.

Eagerly awaiting your response asap.