Tell the dealer they are bullsh*tting you. That is standard motor trade fob off talk. Ask to speak to the General Manager and demand they fix it.Dealer sales staff don't want any post delivery repairs on cars as it's cost goes against the salesman's commission,so he'll try his hardest to fob you off and hope you go away.Be polite but persistant,you'll get it fixed in the end.Threaten them with trading standards if they get difficult, and make sure you DO contact trading standards.It doesn't sound like a major issue and they should fix it.