data disappearing

After losing data on various occasions, I am now p-off with this.<br> My daughter has a top-up contract and after buying R60 worth of data, it was gone this morning, to add, we have got uncapped wifi at home.<br> We went to the Vodashop in Mountain Mill mall in Worcester where a consultant, Mitch, checked the phone for settngs, but told my daughter everything was fine and nothing is on that can use this amount of data.<br> How can this be, where do I complain next? Vodacom can not just take my money like this because how can they prove I used this amount of data!!!