contract of sale is with retailer and customer, nothing to do with the supplier to Evans. If the bike has quickly broken, its up to Evans to sort it out with their supplier. Telling customers “its going back to supplier or manufacturer for assessment is typical B.S. the bike industry likes to tell to clueless customers
I would quote “goods not fit for purpose” and ask for a new bike, or a full refund, well within your rights under consumer law
I used to work for Evans btw, and have heard all kinds of B.S. told to customers with such problems on newish bikes