Is purchase agreement still valid and enforceable? Are the realtors open to an E & O suit?

I'm confused -- you listed and sold your house without knowing how much the loan payoff was? $14k is a bid discrepancy. I could see a couple hundred for interest accumulated by not paid, but not 14 thousand.

Unfortunately I see nothing in your facts about anything a realtor did wrong here. Did they somehow know something you didn't about the loan? How could they?

You may not be able to complain about this, but you need to see a real estate attorney with all the paperwork and financial facts so he can review this to see exactly where you stand. Good luck.