DEDUCTION 4 AIRTIME ADVANCE

I did airtime advance yesterday, and with the airtime I bought power hour and power internet which is what i do everyday. Later i wanted to make a call and the R6.00 balance I had was gone, and at 00h17 I got an sms saying \R6.00 has been deducted from your available airtime balance to repay the R10.00 airtime adavnce you have taken. The R1 service fee is included."This morning i loaded R12 vodacom and they took another R11 for repaying the advance which they took R6 for last night. So now i have paid R11 + R6 for R10 airtime i borrowed from Vodacom. I called the call centre and they are not aware of the sms I received from their company. What's happening with Vodacom? Why am I getting these problems?"""