[John Smith_]

welcome to the forum.
don't get discouraged just yet - this is a common problem and often has a positive outcome.
some photos of your issues would help a lot.
there are several methods of removing stuck bits from the collet.
I see that your router is basically the same as the DeWalt 625. so you can google that too.

 

[John Smith_]

right, wrong or indifferent, if that were my machine, I would put some ViceGrips on the shaft of the bit and start in on it like pulling a tooth. wiggle, wiggle, tap, tap, tap, and slowly move up to the bigger hammers, pry bars and gear pullers.
extreme care should be taken as not to damage the router motor or shaft. it is a delicate dance of determination and experience.
let us know what worked for you after it's out.
forgot to ask: was it stuck like this when you got it from ebay ?

 

[John Smith_]

the only thing I have ever put in a freezer were big bearings to a boat motor.
I've never used any kind of freeze spray. I am fond of bigger hammers and more heat. (but, they do have their place).
some kind of penetrant with teflon would probably work - did you try taping the top of the bit from side to side and front to back in a repetitive motion ? (I'm pretty sure you have LOL). and turning the collet with your fingers while taping the bit with a small metal hammer.
David Falkner endorses this product, but I can't find it in my area. your issue may be a "friction seize" which is just a matter of breaking the bond somehow.