Data Rapid Depletion

I’ve bought 10G of data a day ago and it disappeared in a space of a few hours, in those hours I was driving and was not on my phone except for Waze App for directions. When got home my phone automatically connects to unlimited Wi-Fi and this morning I’m realizing the data is depleted. The call consultant was less helpful because she only explained to me the rate at which my data was getting depleted but couldn’t say what was depleting it. I’ve been with Vodacom since starting using a cellphone and this is the first time I’m disappointed by my trusted network service provider. The call center consultant in question didn’t represent you well Vodacom.