I've pre-ordered 4 Viper ASICs from Alpha Technology on 4th of January 2014, payed 6540 GBP with Bitpay on the same day, cancelled my pre-order on 2nd of April 2014 by email, but got neither any answer from Alpha Technology nor the promised 75% (Terms of Order - Cancellation & Refund Policy) of my money back. In the meanwhile I've sent them (customer@alpha-t.net) 3 emails, but till now I've got no refund and no answer at all.

Did someone else experience such fraudulent behaviour?

Edit: Yesterday (June 20) I've received 1 email from payments@alpha-t.net and the refund of 75% after 11 weeks and 2 days.