your data disappears

My husband and I are at me and you mobile and so are 2 close friends. All 4 of us have endless problems with me and you. All of us experience our data being eaten up in no time. We have all belonged to vodacom before where we did not have these problems. we all had alot of data left at the end of the month at vodacom. I mainly use wifi at work and home and still the 1G I purchase get used up in 1-2 weeks. Imposssible. The friend even buys up to 5G and he has uncapped at home. Me and you mobile says "unlimited" because they know they are robbing you with data packages to get their money back.