Missing airtime for the past two months

<p>I did an upgrade on one of my number: ********** where i got a Samsung A5, since i got this phone, my airtime has disappeared. The first month it happened, i didnt pay any attention, but this month, i lost approximately R300 airtime in a matter of two hours. No one at Vodacom can trace the missing airtime. when i tried to test vodacom to apply for a mature early upgrade on my number ********** 800 because i had to buy so much airtime in October and November, i thought this will enable me to qualify, but it appear, vodacom cant even see how much i had to load every month out of my pocket irrespective that i had a contract of R500 per month, which i hardly had the joy of using in November and this month, because my airtime just disappeared and no one could see what happened to my missing airtime. I'm getting tired of vodacom, this is not how you treat your customers. I need some answers and i need them now.</p>