Airtime deducted by mistake.

I use vodacom subscriber, I have been with them for a couple of years. This year around August I bought a R12.00 airtime. I wanted to buy free minutes but I did find the right option for me. I phoned hoping to use my R12.00 free airtime not knowing that my airtime will be used instead of my free airtime as it is always the case with vodacom. I then phoned vodacom customer service to ask ask to reverse my used airtime. The the person I spoke to did all the investigation with her supervisor. And the following day the lady phoned to tell me that my airtime will returned in a few days but until today I never received my airtime back.