Vodacom stinks

Loaded airtime on my tablet..... tried to convert it to data and Vodacom *111# function doesn't allow me to. I tried four times and each time I checked the balance it said R80!! the amount I loaded!! Phone Vodacom customer care, they tell me its my fault and I'm lying because my sim connected to the internet!!!! this is not the first time this has happened to me with Vodacom where I load airtime and their *111# doesn't work and before I know it my airtime is being depleted. there are no background running apps on my tablet and yet Thabo has the cheek to imply its my lack of intelligence that this happened. thank you once again for *****ing my airtime Vodacom and insulting my intelligence, I can assure you that I will not be renewing my contracts with Vodacom.