MTN Suspending Account without validity

I recently upgraded my contract with MTN. Ever since then they have suspended my account twice already without notice or validity. <br> My account is on a debit order all all payments have been on time for over 7 years now!!!<br> This is my business number which now results in my professionalism being under scrutiny!!!<br> I have spoken to the call centre twice already, and everytime time they promise to sort the problem out, but still nothing!!<br> If it was any easier I would move my contract to another service provider in an instance!!!