I bought my X5T HA3 'used' for a fellow CPF member. 'Used' as in the guy turned it on once or twice and put it back in the case.
When I recieved it, the light had a flicker issue... When C.C. was contacted they offered to take care of it.
I call that excellent customer service, I was impressed... after all, I was not their original customer, yet they were standing behind the product they sold.
This was my first exp with C.C., other than being annoyed by all the 'free light' sales they had a while back. No one's perfect, but it seems to me that C.C. tries very hard to provide good service.
If you read the original X5T HA3 thread in the dealers section one of the C.C. staff explains they they have been having problems with their email server... that might explain the issue you've encountered.
bty, I solved my flicker issue by cleaning the threads and contact points with rubbing alcohol... seems to work fine now.