Vodacon eating up my Data with" Gaming VOIP Streaming"whatever that is?

I see many of this complaint....but it never seems to be resolved. i class it as 100% pure theft. The issue is most of my data is going on something called "Gaming VOIP Streaming". I do not play any games.... When I called the help desk I was told to check in Apps and find it.....nothing there. Then I was told to go into mobile data usage, but I couldn't see anything that would cause such data usage. What is this? How do I stop it?