Customer service

I bought 180 airtime 10 minutes later my balance is 00. I have no subscriptions and my airtime has always been blocked so that it’s not used when I don’t have data. I call MTN they tell me problem will be resolved in3-7 working days . So I ask they lady what do I do in the meantime. do I keep on buying airtime she just said “ unfortunately so” What ******* is this I’ve been with MTN for a long time and I’ve now had enough. 1 gig data does not even last a whole day what ******* is this