Too many customers

I bought rush hour from mtn and mtn deducted my 5 rand 5 minutes in my rush hour while I was on an mtn call I heard a voice prompt indicating that my airtime is exhausted.and thiz has happened most if the time when I buy the rush hour and the 1st time I enquired about this I was told that they had a technical glitch and it will be resolved and it alwaysed happened and each time I call the call centre they instruct meto call after an hour because their sytem has not updated and sent me from pillar to post and due to that when I attempted to call them now they are indicating that I have reached my call limit and my query was never resolved.why did they deduct my rush hour amount although they were billing me de rush hour was suppose to expiry at 19:45 and it expired just 5 minutes on the call and I spoke to a lady by the name of mahlatse and her supervisor lebogang matladi who report to lesiba and she evenrefused to give me her manager surname .as a supervisor I was surprised that she did not even bother to Investigate my problem and told me about thier policy and on thier ,.she did not care at all I have been using my mtn for more than 10 years and moving to vodacom.