I'm now at the end of a very long drawn out process of communicating with Mango bikes. I bought my single speed around 18 months ago and also bought upgraded wheels, pannier rack and mud guards. The bike was generally good quality for the money although the brakes pads are pretty poor (had to change to better quality pads which largely sorted it out). However, after various attempts to fit the guards and rack I realised I could not do it and tried to return them. I contacted Mango multiple times and they simply did not respond. I got fed up and gave up. After a few months the wheel bearings started to grind. I took the bike to a reputable local bike shop who assessed the situation and confirmed that the bearings did not accurately fit the bike so needed to be replaced (or buy new wheels). I picked up the contact again (phone and email) and generally had a very difficult time getting hold of anyone. When I did get hold of someone They said they would be back in touch with me but never did. I tried again multiple times but got bored and very fed up trying to get hold of them. I ended up buying new wheels, separate guards and racks to the tune of £300. I threw the old stuff in the bin out of frustration (over a year had passed by this point). I felt aggrieved so got in touch again. After much chasing and hounding I was told that I had no right to claim a refund as I should have returned the stuff (!). I explained multiple times that I had tried to contact them and attempted to resolve via the customer service team with no success. In the end I was offered a gesture of a £45 partial refund. So the bike is now 'ok' with me having spend double the original value of the bike sorting it out. The customer service was absolutely appalling. One of the worst experiences I have ever had. So if you want an ok bike crack on but do it with hope as you'll likely never get hold of the customer service team. when they've got your money you won't get it back. Overall a real shame and I feel (as another review has stated) that mango need to invest some proper time in customer service and lay off the instagram pictures