Cell C *****ing client data

Have have recently moved from a Cell C contract to a pay as you go as I got a work phone. As I still use the phone for some things I wanted to keep the number and put 50 GB data on it that is valid for 180 days. It was valid for 2 days and then they took it all off. Got a case number and reply but it didnt make any sense. This is not the first time they took money from my account. Very ********* business and will never use Cell C again. They do not explain things and are quick to take tour money.