Excessive Date

I had a Weekender Contract for the past ? 12 years at Vodacom. I also subscribed to the BIS services since I upgraded to a Blackberry phone, At the end of last year (13 December 2014) my husband gave me a Blackberry Z10 and I phone the call centre to do a device switch from a Blackberry 9800 to a Blackberry Z10. <br> On Wednesday we received a message that we have very high data usage. We phoned 082 155 and they did an investigation and told us that the Weekender Contract with BIS services aren't compatible with the Blackberry Z10, and that I was charged R2.00 per megabyte, and ended up with a bill of almost R10 000.00 for December 2014 and January 2015. My complaint as follows: Why did the customer care line did not tell me on 13 December that the Blackberry Z10 will not be billed according to the weekender Contract and BIS. Surely I would not have used all those date. Why only at the end of January did they let us know about the excessive date usage? Why still bill me for the BIS services? Me and my husband is very upset about this huge bill as we did not know that the date rate was charged at R2.00 per megabyte. We feel that we were misinformed about the charges since we did th