eBay

How do I go about contacting a seller about an issue with an item if the dashboard says I unavailable

I made an offer on an item and the sellers counter-offer did not give me the 18 hrs to give them an answer they sold the item before the 18 hours what's up what can be done

I made an offer on an item and the sellers counter-offer did not give me the 18 hrs to give them an answer they sold the item before the 18 hours what's up what can be done