Victimized by datawind for prebooking of akash tablet

I have prebookd akasah ubislate7+ tablet on 2011 and my confirmation ID was pm5d178. As per their advertisement, I have sent rs. 99/- Through bank draft no.274004 dt.22.02.2012 sbi, charichhak favouring datawind innovations pvt. Ltd. Payable at sbi, amritsar main branch for prioritized delivery of ubislate7+ in march, I have also received conformation about receipt of bank draft through email after initiation of graak seva. Till date I have not received the product. On enquiry the company send me mail to pay more rs. 98/- For delivery of the product. Their last mail to me is here under for reference. Subhalaxmi baliarsingha dear subha, thank you for your continued interest in the ubislate smartphone tablets. We apologize for the delay in the delivery of ubislate and thank you for your patience. We are pleased to inform you that ubislate 7+ model has been shipping for the past several weeks and we are trying to catch-up with the overwhelming demand. We are fulfilling all orders on a first come first served basis. Currently deliveries are being made to priority customers that have pre-paid. If you wish to get your device sooner, you can make an advanced payment and get prioritized delivery of your ubislate7+ within six weeks of your payment. At a price of only rs.3499 (plus shipping charges) it delivers anytime/Anywhere internet access, functions as a smartphone, renders hd quality video and provides access to thousands of free apps. Please note that we will also be starting deliveries for the ubislate7c device with multi-touch capacitive screen by august. The multi-touch capacitive screen on the ubislate 7c allows pinch & zoom functionality and delivers a feather light touch interface. We understand that you have waited a long time for ubislate7+, but do not wish for you to be disappointed for not having the choice of the ubislate 7c. If you wish, you can choose to upgrade your order to ubislate7c for the difference in cost of only rs.800. (Total rs.4299) other capacitive screen devices in the market are double the price, and yet don't offer smartphone functionality. If you decide to avail this offer, please mail a cheque/Demand draft for rs.3,698/- For the ubislate7+ (including shipping) or rs.4,498 for the ubislate7c (includes shipping), payable to datawind innovations pvt. Ltd. At the following address: datawind innovations pvt.Ltd. 148, jubilee complex, sultanwind road, amritsar 3001