10-01-2021 12:33 PM
If the replies you've received don't answer your question, please ask again and give more information.
What counts is when and how you paid, exactly when you received the bike, and how you progressed your return, i.e. whether you opened a return request or a money back guarantee case through the resolution centre, and when. Also it helps to know whether the seller is in the UK or abroad (sometimes the product may be sold as UK stock, but the seller may be in China).
Without essential factual information about the transaction it's so hard for people here to advise you correctly.