I bought a mirror from a seller for £30. The mirror arrived broken and seller wont refund in full

[melisstyle5]

So I bought a mirror from a seller on Ebay for £20 + £10 postage. I would assume as a seller it is their responsisbilty over the item and this mirror has arrived broken. I contacted the seller and he has raised a claim with hermes hoping to get £20 for the claim to pay me with. he has offered to pay me £10 for the cost of postage but will not pay me the other £20 unless hermes pay it to him first... 

in my view he should be paying me £30 and just wait and hope on his end that hermes accept his claim and pay him the £20 whenever that happens if it does. 

Is it wrong of me to expect a full refund for this? the mirror will have to be thrown away as it is not safe to use so i dont want to have paid £20 for litterally nothing.

What are your thought? how should i resolve this issue? 

[pixiesen2012]

you need to go to the Resolution Centre and open an item not as described case,

the seller cannot make you wait for a refund,