Hi @wrappy, welcome to Forumosa. Sorry to hear about that outcome.
If my assessment of your posts is correct, it looks like the EZWay app sponsored by Taiwan Customs does not accept details from a foreign resident of Taiwan? A group of us here are capturing and trying to rectify things like this, with some success.
If you were willing to spend a little bit of time to write your experience down, the National Immigration Agency likes to hear about these kind of things and goes to some effort to fix them. It looks like the Customs Administration and Taipei Customs also have English-language enquiry forms that would probably get to the right people.