When I looked into selling my iPhone and compared on the market for the best price, Mazuma was one of the top people that would give me the most money. This is their market strategy. When they received my excellent, no scratches, mint condition phone, they devalued this saying it had more than 5 scratches and reduced the value by £60. I contested this. They asked to see front and back images, which I sent over. They replied saying actually the marks are on the side of the phone, which I then replied with more images - and only for them to respond that my images were not clear enough. I asked to see photos of these "said" scratches and they sent me dust specs claiming that these were scratches, along with a greasy finger marks. It was quite comical, I was in my work office showing this to my colleagues how they are claiming dust and greasy marks they left on my phone as damage. I contested this again for them to circle the dust marks in the images. You can't win. They have the legal rights to deny this and most people would not contest and just accept the low value offer. After going back and forth on emails, the next day I rang up the customer service line and they said the exact same thing. They read off a script saying that they take the images with high tech cameras, use a cleaning solution round the phone etc etc, After going through all this I researched Mazuma complaints and I came across a youtuber who had the same issue. For anyone looking to do the same. I really recommend for you to save you the stress, time and money to go somewhere else. I've had iPhones all my life and never have I experienced this when selling with other retailers.