lousy customer service by tatasky

i booked 1dvr and 2 hd boxes along with an annual mega pack from Tata Sky, i was promised installation same day(12th)today is 15th night and still no call from anyone, i have made approx 25 calls to the customer care asking them for the status, one person says someone will revert to you soon and someone else says that the engineer has called u already to inform you that the dvr boxes are out of stock, and i keep saying that i havent received any call from anyone at all. and they say ok someone from our team will get back to you shortly.this is the worst customer service i have got from anyone. now i am plannin on cancelling this and goin in for videocon, but i beleive that their dvr has some pink flash issue and plus the switching of channels are quite slow.. can anyone update me on this plsthanks