Addressing this now can prevent problems in the future.

Their website does show you the addresses, down payments, interest rates, and monthly payments, so you don't have to try on your own to find a property that works for you.

Banks all state payments transferred within 24-48 hours, but reality is unless you both have same bank, it's 3-5 business days.2) Via BillPay check-You just need their name and mailing address.

Find out somehow where their new address is (not sure how to find this out affordably), and file a lawsuit against them in small claims court and hope they pay or eventually get their wages garnished.2.)

This addresses their primary concern.

The problem has never been closer to having large sums of money to address.  

Now let me address why you may not be getting results.You say, your message is persuasive.Let me ask you something.If Nike sells shoes but their ads that are VERY persuasive reach audiences without any legs, will they sell their shoes?

Maybe you should address the concerns with the agent before trying to fire them, 2 weeks isn't a crazy amount of time. 

Can I use a regular email address for my business LLC?

Address the leak immediately, once the house is water tight get everything dry and then you can approach the cosmetic repairs over time.