Why is a pay-as-you-go number 'cancelled?'

Last week Friday my phone suddenly stopped working. I went through to the MTN shop where they advised that my number was cancelled and that they will re-activate it. No one can tell me why it was 'blocked' or who was responsible for this.<br> On Saturday I called the call center to re-instate the number again... the lady in the call center said she would investigate and call me back- she never did.<br> On sunday I went to another MTN shop and they advised that they will re-activate my number within 24 hours. I'M STILL WAITING!<br> <br> 1) Who gave authorization to cancel?<br> 2) Why in the hell did MTN cancel a Pay-as-you go number<br> 3) Why is your staff unable to re-activate<br> 4) Why can your staff not have the courtesy to get back to me!<br> <br> Please get this sorted. This is an important business contact number and it is affecting me as your customer MTN.