Several years ago my parents had a Volvo 440 with a cvt gearbox.
I took it to the dealer for a winter check up ( car ran fine) ,2 hrs later they phoned & said the gearbox was worn out.
I said how can a 3 yr old cvt box with 23000 miles on it fail? It is DESIGNED for town use.
Cost was over £1500 for replacement.
I rang Volvo UK head office & pressed my case,complained,told them I would be taking the story to local & national ( motoring ) press.
End result was they accepted it was not a normal failure & therefore would cover all costs
RESULT
If I were you I would keep on ,not only at the dealer you got the car from but Honda UK too.
They don`t want bad publicity ( especially as the new Jazz is on sale soon ),so keep on & on at them.
Mike