MTN GAVE OUR NUMBER AWAY!!

On Thursday the 24th March we saw our phone has no signal. I then called our number and there someone else picked up the phone. We have been using that number for more than 10 years it was on contract the entire time, we changed it to paid a year ago. The guy who answered the phone told me that he got the number that morning at an MTN shop. We immediately went to MTN to find out what was going on. They then told us they had no idea and will try to sort it out, they needed to sort it out month ago when we wanted to get a new contract they told us he number does not exist. How is that even possible since we use that number on a daily base, that is our business number and now the clients nobody can get ahold of us. We are losing money and getting a bad business reputation. We are still waiting to get our number back. This is so unacceptable! You cant use your number and then it has been given away. That person got all of our smse's and banking details because MTN just gave our number away. As soon as my contract end in September MTN will never see us again. They are taking our bread and butter from our table and they are cer*****y not in a rush to fix this problem!!