I've never complained via email. The only email correspondance I have had with them was strictly business; for the refund of my Single SC's, an FPGA single order back in ~Mar 2011, and an email for repair of a bad fan in the FPGA. Probably ~5-8 emails in total over my business relationship with them over the last couple years.
The only places I have complained were here on these forums, and trolling Josh about the 1000 BTC charity bet on the BFL shoutbox before he silenced me.
My email address starts with "xian" so it's not a far stretch to match that to their customer database after speaking to the fact that I had early orders.
I was purposely hunted down to be punished and silenced. There is no other rational explanation I can think of.
If you happened to bug the shit out of BFL via emails, then I could possibly see a slight reason for their actions. But if you're telling me that you only once or trice complained via email, but they reversed engineered your user account ID on this forum (and/or possibly their's) because of your critical posts toward them, then BFL has severe mental issues.
That tells me that they took the time and energy that could have been used elsewhere to punish you by refunding your money, and now they don't have to worry about the trade in you were planning on sending them (gleaned from your post history).
Please enlighten me as to which is the case: too many emails to them or they purposely hunted you down. Please be as straight up as possible with your answer, bud.