Frustrated and highly disappointed!

Since November my phone gets suspended each month. I pay on time every single month and when I phone they tell me they don't find anything wrong with my account and switch it back on but then yet again it happens. last month I spoke to a consultant for an hour and went through each and every month since I got the contract. we then proved I have no outstanding amounts and she told me she would send an email to head office and sort it out but today again it has been suspended. I am extremely frustrated and disappointed in the service I am receiving as an MTN customer. I ma loyal to MTN and have been for many years but this is what i get in return.