MTN Business upgrade disaster!

I have had the worst experience upgrading my MTN Business mobile data line. First I am nagged for months to upgrade the contract and as soon as I do my internet off. It has been 3 days now with no customer care consultant able to help me sort out the problem. I have phoned many times every day, had numerous reference numbers but no-one is able to help with my issue. I am paying for data that I am not getting. It is impossible to speak to someone who can help you. It is an administrative nightmare to which is taking days.....!!!!!