Data and airtime disapeared

Hi I've got a Vodacom top-up account through Autopage... I've loaded 500mb of data on the 21/08/2015 getting and sms on 03/09/2015 that my data has been depleted... After which my monthly data should have kicked in which I get on the first of every month with R315 of airtime... My phone was not in use since 9pm on Friday (switched off) until Sunday about 11am... In that time all of my data and airtime just disapeared without getting and sms that my data was depleted... I've been a customer of vodacom all my life and nothing like this happened before. I'm really upset about this and the response I get from autopage and vodacom is that I used it all up. And as I am a Top-Up customer I can't get a printout of the usage... I would like an explanation as to what happened to my airtime and data as this is unexceptable. I don't care about the data BUT I want my airtime back please!