I was offered an amount for my phone with Sell My Phone, Sell My Mobile, Gadgets | Cash for Phones - Home but when they received it they claimed it was scratched and offered significantly lower. I declined this offer so they upped the offer, but it was still far too low so I declined again. This was 2 weeks ago and I've contacted them twice since but haven't heard anything. They have my phone and haven't sent me any money. What can I do?