I recently purchased windows from a company that part was credit and the other part cash. I am in Fairfax VA and the company has threatened a mechanics lien. The billing department statement show $7690 for the window and $4400 for doors to be installed at a later time. Total of $12,090. I got credit for $3600 on the windows and now the company is telling me I owe them $12,090 for windows. That is clearly incorrect. If I have the statement from the company that states what was performed and what they charged me. $7690 for removal and replacement of windows will I need an attorney to pay for their mistake as he claims. I am on a deferred payment plan for the $3600 and have been paying as agreed. Thank you