mtn took my airtime and data

I called mtn today more than 5 times they could not ser where my data and airtime went called at 8:57 and.was asked to call after an hour called again at 10:03 then they said.they dont know what happened to my airtime or data and asked that they will escalate my call and i should call after 2 hours which i did and i was put on hold for an hour called again was disconected and i called again then all.of a sudden they tell me my data ams airtime was finished by internet which i feel ots an excuse cause they dont know what happened to my 96.80 airtime and my data can mtn refund me my airtime thats a lot of money that i used to buy airtime