Amazon seller phone number

Can someone post amazons phone number so i Can ring them up.baseically amazons refunded £80 to a customer for a item i sent signed for second class after them put in a cilam saying it never turned up even thou them signed for it! Thanks to kira i emailed jeff and mangeing director at amazons to show i have a signture to show the customer got the order. I then got a a reply from amazon saying them would refund me in 3 days but thats 4 months ago and Ive not recived the refund and now jeff wont reply to my emailed. I need to ring them but cant find the number anywhere?