Airtime Rip-off

I feel completely rip-off by Mtn on my most recent airtime recharge account. On Tuesday evening, I recharged by airtime balance with R60 over Internet banking and though I it reflected under balanced and I received the usual confirmation sms I couldn't make a call and received the service provider voice prompt to recharge my airtime account. This was very frustrating.<br> <br> After switching my phone on and off and fiddling with my mobile settings a couple of times I managed to make a 10 min call and received the in-call prompt that I have one minute remaining and thereafter my call was terminated.<br> <br> Most surprisingly, I barely used my phone all day the following day due to the same issue of seeing a R48 airtime balance on my phone but not being able to do anything with it. On Wednesday night before going to bed my airtime balance suddenly dropped to R9 and I was completely annoyed because although I use out of bundle rates for web browsing this has been the most irregular exhaustion of airtime ever (I'm not new to depleting airtime at out of bundle rates and I'm able to make R25 airtime go a long way for web browsing and making calls till top up day). What a rip-off Mtn!