Dishonest and unaccountable

Over the last few weeks a lot of my data inexplicably disappeared. It happened twise in December 2015. On the first occation 7gig of data disappeared. They then reimbursed me with 5gigs as a 'gesture of goodwill'. Soon after this 5gigs also inexplicably disappeared. When i complained they blamed Apple's server. I checked with Apple and they confirmed that they did not incur any problems with their server. Now i swithch my router on for the first time this month and find 1.3gig of my data has been consumed. I'm so disappointment as I've been a client of Vodacom for more than 20 yrs. Currently, i have 3 contracts with them. In the past i didn't have any problems, why now? My behaviour ito my use of my devises have not changed why would my consumption all of a sudden escalate to such a degree? I demand that my data be restored or that my contract be cancelled. I refuse to be bul**** by a Corporate!