Had the exact thing happen to me - was new to chase and they closed all my accounts when I was in Bora Bora. Who cares what the letter says. Call 1800 290 1316 this is the Fraud team and explain that you're accounts were closed and want to be transferred to the reinstatement team.
This was my experience:
- I called and explained my situation (new to the US but leveraged my Oz Amex card to get US amex card and that all my recent credit pulls were just for Chase)
- explained how Chase was the best bank and wanted to build history with them
- explained all the charges (DO NOT try and say that the payments were for a friend, but think of how it could be your spend through paying 12 months in advance, etc)
- they said they weren't going to approve my account, but encouraged me to pay off the outstanding balance and not apply for anymore personal card and then call back in 30 days
- did the above and called back. Explained the same story and was approved again with everyone re opened (personal and biz card)
DM me as required