What did you pay initially? £100 off sounds like they knew, they were in the wrong.
I second this, it does sound like a 'whoops, I got caught out, sorry mate' kinda payment. Edit: Having seen your reply I think I and Mikkel are probably being cynical. eBaying bikes has that effect.
@vthejk started
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What did you pay initially? £100 off sounds like they knew, they were in the wrong.