Data dissapeared after 12 days on new contract

We joined on the 3rd of October with a router and wifi contract. ( it is a 14gig contract) but now, as on this date the 17th of October our 14gig has vanished which is outrageous! We only do facebook and whatsapp on our phones and a you tube video or two but the gigs has vanished. This is unacceptable and I would like an explanation how this is possible and where exactly is the date. If not, we would like to cancell this contract and stop wasting our money as we got this contract because it is easier and much cheaper than buying data.