Add SmartData for R500 on my account I did not ask for this

<p>I have contract with Cell C for a laptop and 2GB SmartData 24 Months which I pay for R86.84 for 2GB and R315.79 and Postal Delivery Fee of 5.26.</p> <p>My 1st of July 2016 statement show an extra amount for R500 for Smartdata Internet. I cannot get trough to their office to ask them why and I e-mailed them. Please people check your statements. </p>