Unexplained Ghost Data Usage

Around the second day of Feb I received a message that my 1G data had depleted to about 200mb. I recharged with 1G and within minutes that was also depleting. I was not using the phone. After an unsuccessful call with the call center, I went to a vodacom outlet , numerous times for assistance. No one could help, even when they called the head office. All they could say was the rehe****d and irritating speech that iPhones have a problem because they have background roaming, blah lah nonsense. This was their argument even after they checked that all my apps were off, the roaming was off and there was nothing they (the fourways mall agents) could find. I even told them that its not my first iPhone and I know how to manage my apps, back ups, updates etc. If I couldn't, then I should have had a problem all the other months too. Queries were logged but no one got back to me. Its March now and at 6h23 AM on the 1st, my data reported at 200mb, from 1G. I am am beyond livid with Vodacom and will keep blasting complaints until my data is reimbursed and I can use my phone because all I am able to to now is send SMSs since I cant use a simple messaging app like Whatsapp. Vodacom GET BACK TO ME