The messaging system has been suffering some issues for some.  Try to send one from the seller's current listings, far right ' Contact Seller'.

Was this a Brand new item sold from a UK seller, who offered a guarantee on this item?  If not,  it's truly not worth trying to contact this seller, as you say 30 days have passed so you cannot claim anything from eBay , you may be still in time to try your payment provider most offer a 120 day payment protection policy,   but I fear you may be too late here too.

@kellyw7363