Such a dick move.
Do they even have the right to destroy your hardware, wether you know the device you have contains a fake chip or not?
I thought FTDI were a reputable company that produced reliable hardware & software solutions, especially their USB-TTL/RS232 chips, but this is such a dick move, people who have heard of or experienced first hand what they did won't want to trust them again.
If you're in the market for a device that uses hardware of a type that FTDI manufacture, how can you be 100% sure it doesn't contain a fake FTDI chip before you hand over your money?