removal key stuck in Ford CD 6000?

I got two of the removal keys stuck in my Ford CD6000 (Fiesta 2006) whilst I jwas trying to get it out and so I went down to Halfords to see if someone could help me and a young man, who should have just told me he couldn't help and not touched it, managed to get the other 2 keys stuck by forcing them in the wrong way. I now have all 4 keys stuck in the stereo. Is there any other way that this stereo can be removed, or am I totally stuck with no way of ever getting it out?