unnecessary extra billing in data

on the 1 Dec I did the upgrade of my line *** and as in my previous contract I ask to this employee CHE to include in my new contract 500 Mb extra of data at the cost of 99 rands. <br> I understood he did, we went with my family on holidays from the 26 Dec to the 5 Jan the end of Jan when the invoice arrive the total was over 1700 rands, when my average monthly expend is Rands 850. in Feb the bill come with over 1400 rands, I went to MTN before end of Feb and explain how is possible the highs increase of the data expend, my surprise when I knew the employee Che he never include the extra 500 Mb of data.<br> since then I claim for include the data since 1 Dec when the contract was upgrade and refund the extra cost was charge as was unnecessary if the employee do his job professional, but he didn't .<br> Yesterday I went again to the Shop and I continue waiting to the credit in the account and the 500 Mb of data continue without be allocate yo the account! Service is 0 and the response is really inefficient from the ***********s employees manage the attention to the clients. and of course the bill is in 1100 on the 10 of the month! I am with MTN since 2001 and really the service is bad!