Airtime and data thieved

I requested that my bb10 service must be de activated. After 2 days aomeone phoned me back and confirmed that the service has been de activated. Yesterday I checked and my balance was R43 airtime and 2.1 gb data. This morning everything was gone and my balance on o.oo for airtime and data. Why all of a sudden after deactivation of bb10 all my data is gone ???? I loaded 3gb data last week and normally it last me close to a month now its all gone in less than a week. Please a quick respone will be appreciated. Tnx Nico