Poor MTN systems

I'm now at my wit's end..Not the 1st time I've had an issue with my airtime getting depleted despite having bundles ..Everytime am sending an sms over the last few days intermittently it's taking mostly out of my airtime & sporadically out of the bundles ....in just 1day despite having more than 50 smses collectively,I have lost at least R15 or more airtime....If MTN not prepared to investigate & reimburse me then I will have to port out the number like I've done in the past..Pains my heart that this is the network I always promote to all & have successfully change over so many folks over to MTN yet I seem to have nothing but issues of one sort or the other ...System glitches which mar the expirence of what is a world class best network performance ..Love this network & customer services call centre agents helpful , friendly & nice yet now find myself anfuriated because I always seem to come on the short end of issues expirencedthats always costs me & ends with me loosing out financially... Let's hope they get back to me...I will give them a week to resolve over which I will try to finish all airtime /bundles etc & leave the network for good & start a campaign of awareness to all consumers across all channels...Enough is enough...I use on average at least R1000 airtime a month on my various numbers on the network...if they don't appreciate my business and patronage & goodwill free publicity I give them. It's time to bid a final unpleasant farewell..