What can I do I bought a house now I find out I was lied to about the construction?

I closed the deal on my house in October, We bought under the promise and so called proof that the house was a stick built and not a manufactured or modular. Yesterday I found the metal plate that proves that it s a manufacutred or modular. I am afraid if something happens to my house the insurance will not cover it and try and charge me with fraud. But I did not know. I have been lied to. This is Washington state any help is appreciated.