Poor service and no response

I was on the rand value contract and did not use all my airtime every month,which resulted in a carry over every month.When I upgraded in April 2015 to the minutes contract I have accumulated an amount of R6921.00.Within a week after the upgrade was done I received an sms saying that,that accumulated amount(R6921)will expire on 2015/05/22.<br> I went to MTN head office at 14th avenue Roodepoort and was assisted by a Mr Willem Loots to find a solution for me not to forfeit the said amount.He told me to give him 24hrs then he will send me an e-mail to say what he has done.After 3 days I've heard nothing from him and it took me another 2days to get hold of him on the number he gave me ***.<br> He then told me that he was just about to send me an e-mail and that the said amount will be put in a separate wallet so that I can use it as I wish when my airtime is finish or use it for data bundles.I did use about R500 for bata bundles.<br> Then on 2015/05/22 the rest of that money had expired.Since then I've tried to contact Mr Loots several times but with no success,even went there with no success due to a strike.<br> I've lost about R6400 and it's unacceptable.<br>