'I need to cacel my booking but Tripsta's Phone not working <snip> I called Airline but they are not able to cancel ticket and told me that I must contact Tripsta for cancellation.'
Although we may never hear from pram0d55 again, the cancellation of his flight may be the least of his worries. Since Tripsta hadn't paid their bills (to the airlines) for who knows how long, there may be no ticket to cancel.
In that case, if Tripsta had placed a charge on his credit card which was processed but there is no ticket then he could contact his card provider to see what could be done about disputing the charge. If Tripsta had made a booking and paid for it then it was very likely a nonrefundable ticket and the chance of any refund there will be microscopic.
PPC's post 135 is probably fairly accurate for a number of people who complain about third party ticket floggers. Too many people have the attention span of a mayfly....