Never had a response to any email from anyone at Amex, ever -- but I like your style.
In each of your e-mail, is a link for you to click, to see your e-mail from a web site / web browser, instead of your e-mail program. You can log in to your AmEx internet banking, then go to online chat, give them the link, and say that your loved one is stuck in UK / Italy, and can't get out, and this e-mail is not nice at all.
I have done the exact same thing, with the previous AmEx mass e-mail stuff up, when they addressed customers as Dear 123456789012345, are you missing out on points? Went on chat, told the operator that, yes I understand I am just a number to AmEx, but please don't make it so obvious, and they re-sent apology later.
The most drastic one was from a gift company, which sent me an e-mail: 'Hi Chicken, do you know, today last year, was when you sent this gift [insert photo of the gift] to Hot Chick? If you have not given a gift for a while, maybe it is time you send one!'. I replied back, saying Hot Chick was my ex, we broke up already, I am upset, but not too depressed as yet, but imagine if someone else was depressed and were to jump off Sydney Harbour Bridge (yes, I really did say this). They replied back in under 24 hours, fully apologised, and said they would be more careful, and would not contact me again.
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Instead of being assertive, you would be surprise how much responsive if you could play a drama queen appropriately.