Yeah this. ^ At this point I would be pulling out if I was the buyer. The seller pissing me about/dragging their feet would not impress me. They might have a rental contract that they need to give notice on.
We pulled out of a sale some years ago. The seller agreed a price, then when we were 2 weeks from completion, and everything was good on our buyers end (as they were just living with parents,) the sellers said they want £2500 more from us to leave the nice fire surround in. (And the nice coal fire.) If we didn't pay it they would take it out, remove the fire and brick up the fireplace!
We asked the estate agent to speak to them and tell them to not be ridiculous! They wouldn't budge. So we pulled put of the sale. Found another house a week later, and were happy there for 6-7 years, then moved to downsize to our smaller home we have now.
The buyers who owned the house that OUR buyers were buying, weren't impressed, but that wasn't our problem - it was theirs (the people whose house WE were buying.)
The house we pulled out of was on sale for another 9 MONTHS before it sold. And the one at the top of the chain - (not the ones we were buying off - the ones who they were buying off,) sold straight away afterwards as there was someone else who wanted it.
If I had been your buyer @Scout9 I would tell you where you can stick your house!