thanks, you won't believe how much stress and hardship this is causing. they have agreed to issue a refund once they recieve the gearbox back, ispoke to them and pointed out it was their error in sending the wrong one and they said they'll arrange a courier to collect it and then issue a refund, i'm not 100% confident theat they will collect it or refund as it has taken in excess of 20 phonecalls as they never call back and were always fobbing me off with 'we have the right one here and we'll send it this afternoon' when in fact they didn't have one at all. my credit card company said they will not get involved until the gearbox has been returned but i cannot claim for return postage as i would have agreed to pay it. I'm worried that i'll be stuck with a gearbox i have no use for and no refund. what would be the best thing for me to do? many many thanks for your replies, it has helped me and my wife to calm down a bit lol.