Forced Global Pass

I am traveling internationally. I have my mobile data switched off and my data roaming switched off. I still keep getting charged for Global Pass. The rep is telling me that it's out of their hands, the only thing that can be done is to remove Global Pass off my account in full. This does not seem correct to me, there are some days where I absolutely want to pay for the global pass but for 85% of my trip the town's WiFi covers all my needs. How is it possible that turning off mobile and roaming data doesn't stop the phone from connecting to cellular?