• I would recommend a 'seeking legal advice' route, per Citizens Advice Bureau if you can get an appointment. It's the most calm route to go down, if you can at least have a paper trail, and make a short diary (like you have here) of what happened on what dates with who.

    The last time I had something similar I went through trading standards, because the company was actually an independent. Trading standards called me and were very interested to hear of the issue and offered advice on how to resolve. They followed it up later, but the threat of their involvement was enough to get everything resolved with the retailer.

    Needless to say, it got sorted, but I never found out if TS took it further behind the scenes.

    Get everything calm after a night's sleep.
    Concise paper trail (for explaining).
    Comprehensive details (because).
    Contact trading standards local to the business. Be nice.
    Ask for clear advice on next steps based on concise version.
    With the patience of a saint, contact the store to let them know trading standards have been informed, if applicable. Don't allow any escalation, just keep repeating you're looking for a suitable resolution.
    Get a new bike out of it.

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