Had mortgage and note on the property.Buyer failed to get insurance is my understanding even though it was in the agreement. 

These deals are very risky, frequently fail, require locking up your capital for many years with no ability to cash out or sell your position. 

But you failed on that so you want me to pay you to get rid of a problem that you created.

However, when the first buyers failed to come through with cash as specified in their terms, the seller pulled out and offered us the opportunity to purchase the property at the asking price, and we did.

Maybe you fix one part, and another part fails. 

They can say you failed to make a repair and wish to withhold ent to get previous rent returned. . 

Few bookings, lots of cancels, inaccurate information and a total fail synching with other software.  

We have also addressed where we fell short and failed to follow through. 

If they failed to pay the bill and utilities are shut off, they are responsible for any damages caused.

The fact that she failed to disclose the animal indicates that it's probably not a legit ESA.2.