missing airtime

at 13:00 I viewed my balance (by dialling *111*502# like I always do) prob ten times a day. I haf the full R200 airtime (which I received on the 1st) plus some R20 something airtime AND +- 100meg from a 7 day bubdle I purchased on the 31st. i didnt buy a bundle on the 1st as I usually do because I had bundles left from the purchase I made on the 31st. working for vodacom myself I know how to turn off background apps, close apps and browsers regularly. it wasnt even an hour later I couldnt connect, did a balance check and Everything was on R0.00!!! how the hell?? i called 082111 and they tokd me ive been using clean airtime since the 1st thats why everything is finished now. i told her it cant be because i viewed my balance not even an hour ago and there were lots of bubdles and airtime still available?? she went further to say at 18:27 is when all got depleted. its not even 18:27 yet and if she meant yesterday, how was i still able to call and connect at 13:00 today? if this is how u think u can fool your employees how are u fooling clients?