Billing for Data used???

Upgraded to a Smart M contract on the 27th December 2014 at Vodacom in Vodaworld. <br> Handed phone in for repair the first time on the 2 January 2015 at Vodaworld.<br> After receiving the phone on 9 January 2015 the same fault exist. <br> Phone was re-booked on 15 January 2015 and only received on 23 January 2015 after I had to enquire at Vodaworld.<br> On the invoice of January 2015 an amount of R 299.00 were deducted for Data used.<br> We only used Whats-up and SMS. We did not even used the phone for e-mails, Google or any other internet applications.<br> Was at Vodaword on the 29th January 2015, at counter 7with Alina, who indicate that she cannot explain the detail of usage.<br> She gave me a Service reference S3-8U922-2FHG7 and indicate that an exsplenation would be given via e-mail within 7 days.<br> Up to today I am waiting for an explanation of this high cost of Data that \was used"by us.<br> """