I am fairly new to Ebay and this is my first problem. I sold an item, low value, and posted Royal Mail second class. Buyer companed item hadn't arrived 8 days later, I checked the tracking number on Royal Mail website and it wasn't delivered. Checked again 2 days later and it said it had delivered so I forgot about it. Another week later the buyer back in touch saying it hasn't been delivered and wants a refund. What should I do? Do I start a claim against Royal Mail, get Ebay involved or just issue refund?