hidden@nospam.priv declared for all the world to hear...
> Locking someone into a contract for 18 months and charging them £300+ to get out of it is immoral,
> punitive and unfair.

No it isn't. Your friend knew what he/she was getting into and had 14
days to cancel if not happy.

> Since she is a 3 customer and has not entered into any contract with whichever debt collection
> agency they choose to use, how do they have the right to add their own fees on top of the original
> debt, and are these enforceable in court?

I think if your friend paid up in a reasonable time there would be no
fees.

> Any tips or advice would be greatly appreciated and sorry for the length of this post.

Your friend needs to find £313. In reality there's no point cancelling
early as your friend will still end up paying £313 in line rental and
will actually be able to use the service. If you cancel early you still
pay all the line rental but with no benefit!
--
Regards
Jon