MTN working with ********** as they are failing to assist us with our number that has been clowned

I am very disgusted at the service that my husband received at MTN, wait a minute, no service was rendered. My husband had an issue with MTD and decided to pot to Telkom, on the 12th April his number was potted back to MTN without his knowledge. He only realized this on the 21st April when we phoned our friend and mentioned that we are using a different number. we then decided to go to MTN mall of the south, were a guy "assisted us". He did not say anything, just told us that the number will be active in 24 hours, which was a lie. we called in and we were told that the number is still in use and someone else was using it. They asked him to confirm the last time he recharged the line, he tried to explain that it has been a while as he potted the number. the call centre told us to go to the store, and the store told us to call customer service. Who is not doing their job here???? this is really upsetting as Zimbabwean guys are the ones trying to go into my husband's account and now the smses that supposed to come in to him, they go to the zimbabweans as they declined the sim swop. Get we get the service that we need before my husband losses his money.