Today I found out my account has been charged for Global data plan ($25/month) from last November. After talking to CS, figured out it was added when they were handling device swapping.
I didn't request for it and any text message or email was not sent regarding account change. CS could not explain why they were not sent, but insisted regular mail was sent that we never received. I usually don't check statement as I have paperless statement and automatic payment set up.
I tried to escalate this issue, but they just gave me corporate mailing address. Is writing a mail the only way to resolve, or is there any phone number or Email address that I can contact? I've been a customer over 10 years.