Everyone warned about those kinda of websites... No wonder outsourced creation of vanity addresses handled incorrectly can can issues...
If you have proof that they stole the funds themselves you should post something on scam accusations.
https://blockchain.info/address/1ERickJ7a2NHm5xKpBKehheNbEK8WYKLa4The two most recent transactions. I don't have proof anymore the e-mail I received is gone, just trying to get the word out.
I wouldn't be suprised if bitcoinvanitygen.com was the same owner and will start doing the same thing anytime now.