same here, i got that shady looking letter with handwritten envelope and a typed letter that looks like it was made by some scam artist on their home computer... didnt even bother, threw it away.
(same thing as the redondo beach complaint listed below) - had the 1 8 6 6 7 4 0 8 3 9 9 number. the logo was in black and white, looked like it was copy and pasted from some official website.
signed by laura shane vice president dated janurary 10th with. Also it mentioned that they tried to call me repeatedly, and the caller id on my phone never registed a "US Airlines" as the caller.