I've been facing the same issue recently. I tried unticking the 'Offers
to buyers' option in the Communication Preferences, but it didn't fully
stop the offers. Browsing while logged out seems to be a temporary fix,
but it's a bit inconvenient. Hopef...
You should wait until after 31st December to open a dispute if the item
still hasn't arrived. Use the eBay Money Back Guarantee to get your
refund. Don’t waste time with more emails if the seller is not
responding.
eBay's customer service can be difficult to navigate sometimes. Have you
tried using their Live Chat option? It might be a quicker way to get in
touch with someone who can help.
It’s really frustrating when this happens. If the website showed free
postage, it’s understandable to feel misled. Have you tried contacting
eBay support directly? They might be able to help with this.