Non delivery of tablet since 6 months and have done pre-payment

Location/place: Kangra

Name of company/service: Datawind

i have booked tab on Sat, Jan 28, 2012 at 4:41 PM via Ubislate official website i.e http://www.ubislate.com and my booking id is “PM9F99A60B8” i have pre-paid by demand draft from U.C.O Bank D.D no “362157” and is sent by speed post on dated 17/02/2012 to provided address in website.please help me to get rid of this problem