Hi and welcome to iMore.
As Speedygi says, how much data do you have included in your bundle?
There is no way you should be running out of data within a minute of loading the bundle on your phone unless your bundle doesn't come with any data as standard.
If your bundle is even as low as 100Mb, no apps will use that much data in such a short period of time potentially unless they are running or you have elected to update an app via cellular instead of wifi (Mobile Data (May be called something else in your country, i'm in the UK) > Mobile Data toggle then set which apps you want to be able to use mobile data for lower down that page) and/or you have Background App refresh on (Settings > General > Background App refresh)
If you go to Settings > Mobile Data and look at Mobile Data Usage Current Period, it should tell you how much data you've used too.