I had an sizing issue with a bike I bought in store (no advice given). Because the model had been superseded by the time my subsequent research was complete. I was unable to return it and get like for like in the right size. Expected to surrender the the advantage I gained from a decathlon sale to get the new model proved too expensive for me to consider. The store management would not allow an exchange where I offered to pay the difference between the retail price of each bike (old model/new model). I asked to go higher than the store manager and they would not give me details of who I could speak to. So I used e-mail contact with customer support. I got a reply asking for details which I then supplied. Thats where the trail ends, I'm not happy with customer service from start to finish. The product was fine but regrettably returned instead of exchanged.