Monthly airtime not sent

I receive Data airtime and SMS on a monthly basis as per my contract. this month I did not receive my airtime. When I called vodacom the agent tells me my airtime was converted into data I only received R10 of the R110 I asked who gave that authority he couldn't give me an answer he gave me a reference number and tells someone will call me.

Then I get an SMS requesting feedback which I rep**** that my problem was not solved. A lady by the name of Nonhlahla calls me I tell her what happened then she tells me that on the 1st I was making a lot of calls I then I tell her most calls were voda number and were done on power hour she then said it's impossible and ask if I have proof of the power hour SMS I then ask her y is she telling me a different story from the previous caller and she said she is looking at the system so I hanged because she was not willing to help as I explained to her no airtime came through, I still want my R110 airtime from vodacom and they have bad service