A year is long enough for most things. There is no point in waiting any longer.
There are at least two parallel threads where bods rejected their bikes successfully, both fellows ending up happy with the outcome. Read through them, sifting out the junk replies. Copy the usually very simple advice given by the two bods who rejected their bikes and all will be well; maybe contacting either or both of the chaps via PM if anything is unclear. If things do not go smoothly, contact a solicitor.
I'd wish you good luck (or suggest you kill the dealership with fire) but you won't need it, whilst the bracketed suggestion is just silly.... Though it will save some other bod telling you that that is exactly what they would do, telling you that they'd be piss-boilingly angry. That they wouldn't carry through with the act is an absolute certainty.