excessive data bill due to incorrect package

Gooday<br> <br> In December 2015 I was repeatedly contacted by Bayside Cell C branch to upgrade my contract as it was due to expire in Feb 2016. I went into the branch & told the sales person that I was currently not paying any data costs as I was on the BB fair usage package with a bill around R250. I then was offered the Blackberry Leap & was assured by sales person that if i upgraded to the Black berry leap contract I would not pay any data costs as i would be able to get the BIS 2 gig fair usage deal on the black berry leap contract. So I signed up for the deal which my monthly bill would be around R260.<br> <br> However to my shock the bill was R850 for the Jan 2016 month with all the extra costs being for data & non of my fair data usage of 2 gig was used. I then enquired about the high bill & went to the bayside cell C shop & was told it was the incorrect bis settings on the phone &so they changed it.<br> <br> Again the followong months of Feb & March the bill each month was now R1200 & again I went into the store & demanded my refund of the data bill as it should have come off the fair usage bis not me paying for data..<br> <br> I have yet to recieve a refund for data I'm not suppose to be paying for..