Hi, You'll find complaining to KIA UK is the only way forward, the dealers will not get involved in a lengthy argument about the fault you and so many have, they just want the service work and labour cost's, if they did'nt they'd all be out of work.
Kia Customer services rang me yestareday and informed me, very politly.. Forums are full of time wasting complainers who only complain with thier key board.Your rattle will be with you for a long time unless the transmission is taken out... at your cost. £500.00 labour straight away. Kia explained its out of warranty and tuff... if its a design fault.. you need to email KIA UK with the Transmission complaint about rattling... as we all do.