MTN THE WORSE SERVICE PROVIDER

I am a very disappointed customer; my cell phone number has been hacked in the early hours this morning. I have been on a call with MTN since this morning with absolutely no help at all i need to block my number as the hackers has now used my number and asked my contacts for money i need this matter to be sorted out as soon as possible this is my business number and i cannot do any business due to the inconvenience that this has caused and now i can't even block or do anything about this situation , please i need this matter to be resolved as soon as possible this is affecting my business in a negative way .

A VERY DISSAPOINTED CUSTOMER