Hi, I am not pleased as I have a contract with Mtn Cresta, the number I have is being shared,

Hi, I am not pleased as I have a contract with Mtn Cresta, the number I have is being shared, and we have paid for this number when it is compromised and other users are on the number as well. I have missed out on 6 months of my data as per the contract. I have not used my number yet it is still in operation, I have been to MTN 3 weeks ago 3 times. I spoke to an agent and I have been waiting for my cellphone contract and number to resolved yet it is not resolved. I am receiving no help from MTN and I am losing out on my data which we pay for monthly. Mtn Cresta have made no effort to fix this situation or compensate me for the lost data over the past 6 months.