No Assistance

So I've been using Cell C for the past two years or so and since last year November/December they have been deducting my data and airtime even though I was not logged onto the internet, they have been sending queries to their technical department or whoever and their response to me was that I made international calls or downloaded stuff from the internet (which is not true). Today they deducted my data again and when I called customer care, I was transferred to the technical department and to my surprise, the lady hung up on me as I was telling her my problem, seriously????