Mtn the worst!

My mothers' number was deactivated because she as a pensioner does not make frequent calls but does use her WA on a daily basis. I went in to MTN with her whilst she can hardly walk. There I was told to call customer service. They gave me the options I have to choose, which was not so. After chosing almost every options I came upon one where I will be directed to an operator. Then the call is being disconnected EVERY TIME! Mtn really has the worst service overall. She cannot change her number everywhere because MTN decide they do not make enough money out of her for her to keep her number!