unknown charges

good day<br> <br> I took out a contract for my son and was told there will not be additional charges the contract is R350 per month.<br> kindly have these charges refunded and confirm that there will not be additional charges generated on this contract <br> <br> now there are additional charges of below<br> <br> Usage Fees<br> Data R 122.00<br> Subtotal (Usage Fees) VAT included at 14% R 122.00<br> Other<br> Once-off Internet Bundle R 78.00<br> Subtotal (Other) VAT included at 14% R 78.00<br> <br> account details are as follows below<br> <br> Account no ***<br> Service ref ***<br> Invoice no ***<br> Invoice date 01 Sep 2015<br> Due date 30 Sep 2015