Data roaming

I called vodacom on the 30 June 2015 to activate my phone to roaming as I was traveling on the 1st of July<br> Was told by call centre agent that a deposit of R5000.00 was required per no I turned it down stating u would purchase my own SIM card abroad. Left for holiday no roaming was active on phone . Got back on the 12th only to request my itemised bill and WOW I was billed a small amount for data roaming on the 3 rd July but my sim was out of my phone and I had local sim on . Spoke to Vodacom they came back saying it was a system error that allowed my no to be billed . I feelevery consumer out there needs to know what he or she is being billed for and is it legit . I feel it's time Vodacom starts answering for this ,thiys makes billing questionable . I will be challenging this but if anybody has had the similar complaint or a data query contact me on email [Email Removed]