How do I cancel a Home improvement contract after passing 3 day right of recision window. 10 days into contract I started the request to cancel.

Contract signed in my home. I was not verbally advised of 3 day rule but noticed it on my copy of contract too late. Both copies of right of recission are on my copy of the contract. I don’t remember what the original looks like. Should the right of recision Copies be separate from the contract? This company has very dishonest tactics and I am willing to forfeit deposit if I have to in order to get away from them. I just want to make sure when I cancel that it is final and I will owe them nothing else. I don’t trust these people and afraid they will add charges after I cancel. Any advice you can give me? Thanks, Maddy