Vodacom is the worst network provider out there

I bought R55 and R10 voucher of which R57 paid for my airtime advance and in that moment the money that was on my INAccount was R8. I then bought 60Mb using my airtime advance which was for R9 meaning I was then left with R8 on my IN account and R41 airtime advance to use. I then used internet and to my surprise I was charged from my IN account. I called the prepaid Call Centre and nobody seem to know what they were doing and they seem not to understand their own system. Can Vodacom please refund my airtime and stop this nonsense of bullying us customers, we use our hard earned cash and we don't deserve such treatment and last train all your useless good for nothing agents on both soft s****s and systems