I need to know

On the 24 April i bought the 10gig LTE from telkom and received prorata data which was fine and on the 11th May my prorata for April as well as my May 10 gig data was finished. I went into the store to find out and they said they dont know why. Maybe the router is faulty i should bring it back. I asked if no one can check with my number or ID number they said no bring the router. I left the store and later on phoned the customer service of they helped me and sent me my statement which read that they only sent me 5gig for May. Id like to know why. Coz i bought 10 gig night and 10 gig day. They dont know either. I went to the store to say clearly telkom data is not as bigbas they say because im hardly at home coz i work i only connect when im at home what finishes the date. I was told i must switch it off when im not connected coz it uses the data. I asked how coz im the only one with the password. No one knows. I dont have time to go to Cresta coz i work in sandton and everytime i go there they are about to close and cant help me coz i get there 17h45 due to traffic.