Data & minutes disappear

Since mid-December my data started \disappearing". I called 111 and was told that it is a data setting on my phone. On your operator's advice I went to the iStore in Cresta twice and they could not find any fault with my phone. <br> I called 111 again after seeing my bill. My bill is never more than R2k and now all of a sudden it is R 3085 & almost R 4k. I know that it is because of me buying more data disappearing whilst I was trying to keep in touch with my elderly parents and siblings in Australia. After almost twenty minutes on the phone"