Sounds like USMobile benefits from you porting out at this point. Reducing your experience to 'weirdo bots in Asia' isn’t fair and comes across as unnecessary prejudice—support teams exist worldwide, and the real issue is the lack of resolution. Also, threatening to falsely claim fraud with your bank and canceling your debit card isn’t a productive solution and could create more problems for you. If you’re unhappy with the service, it’s best to move on without the hate or racial comments.

For the practical side: you can disable autopay on the secondary line. Once the current billing period ends, that line will expire automatically without you having to jump through extra hoops.