answers

1. 你说A把地板磨光打蜡之后请的B，B又怎么知道A曾经弄坏了地板？ Because payment from A was directly sent to B.
2. B提及A的目的是什么？ I believe his purpose is not to pay his damages. He blamed A did everything.
3. 你和保险公司的矛盾到底是什么？B's insurance just listen to B's lies, not to see the fact.
保险公司拒绝了什么赔偿？They rejected B's liability on every damage B did include the room B damaged.
你说的"全房间磨光打蜡的钱" 包括A弄坏的房间地板还是只有B弄坏的一间。 Entire home.

Thanks for asking. Hope this is clear now.