Can anybody help,

I have a Ford Focus 09 and recently had the head unit changed by Ford under warrenty. However at first use of a copied CD it has got stuck. My local Ford garage will not accept that it was anything to do with them and want to charge a stupid amount to send the unit back.

I know your not suppossed to use copied cd's but they worked fine in the previous unit.

Any help on how to remove the stuck CD would be greatly appreciated