incorrect billing for data in August

i phoned Vodacom informing them about data disappearing in both my private and business phone. i was refunded for my private phone. my business phone bi came up to R2900. with almost R2000 for data, more tban R500 per day which happened apparently at the time i was i flight to Dbn. all day i was in court on the 16th and phone are mandatory off. Vodacom must own up for this bill. I have paid because they have my account details. I was my refund