I believe the fault lies with the retailer. Unless you insisted on the incorrect frame size, it is their responsibility to represent the brand accurately and fit you correctly. Literally, who completed the paperwork (or online form) to order the frame? I'm assuming it was an employee of the shop and not yourself. However, having said all of that, you did accept the frame and ride the bike. Your acceptance, no matter how coercive, may seal your fate depending on the laws in your country/locale. It sounds like they may still be willing to help, although it's unclear what that really means. Swapping parts and adjusting the bike to the extreme is no way to get a great fit. I suggest you take the bike back immediately and stick to the demand for the correctly sized frame. You know what you need. They now know what you need and are aware of the error. Time to fix it correctly. (IMHO)


-Kedosto

Edited to add: That's one sweet bike. A 57cm would fit perfectly underneath me (according to VN).