Billed over R500 abd 400 in less than 24 hours

vodacom was billing customers incorrectly in Aug. on 16 th Aug i was in flight to Dbn when i apparently used data and charged over 500. all day in court with my phone off i continued to use data. the following day same story. when i dispute this with vodacom i am told that my data was running in the background. i have been with vodacom for years, i have used out of bundle data but this is not on. Contrary, i experienced the same problem on my personal phone and my data was refunded. just because this is a contract i am taken for a ride. i want answers. i want to switch to another service provider but the company i work for is with vodacom