Peoblems pairing my bluetooth belkin keyboard with iPad Air2

I bought a new iPad Air 2 last night and the salesman convinced me to buy a Belkin QODE Slim Style Keyboard with it. But try as I might I cannot get the keyboard to pair following instructions. the iPad pairs with other bluetooth devices but although it can "see" the keyboard and although I can get to the point where I press pair - it will say it is "connected" for about 20 seconds and then switches back to "not connected". During the time it says it is connected the keyboard does not seem to work so I'm guessing it isn't really connected. I'm ready to take it back to the shop as faulty but just thought Id check here first just in case anyone has any advice.