Business ProfileforDenver Egress Window

They charged me for a 4x4 window and only put in a 3x4 window. The owner yelled and used profane language and threatened to *** me and same with the manager when this is*** was brought up to them after i had paid and noticed the error.The story is as followed. I signed a contract for a 4x4 window with a sale price of $6250 but I changed the window to a 3x4 window as the cost of that was $5100 as it was more in my price range. I spoke with their manager and sales rep to notify them of the change. They put in the 3x4 window and charged me the price of a 4x4 window, $6250. They called to settle the bill the day after they installed the window. I asked for an invoice prior to paying so i could pay the remaining by check, but they pressured me into paying that day over the phone. After i paid, i realized the error in the overpayment. I called back and told them of the overpayment and the manager agreed i told me she would refund me $100. I was taken aback as the price difference was $1150. i was told i was trying to steal from them and that they had never agreed to the price of a 3x4 window and that had spoken with me about the price, which none of this is true. The owner jumped onto the call and began to yell at me, call me names and curse at me. They refused to give me the difference back and honor the price of a 3x4 window. Since i paid the amount what was on the contract, I asked them to honor the original contract and install a 4x4 window. They wouldnt do this either. After they hung up on me, they did credit my account with $400 which I didnt agree to. To me this is attempt to hide their crime. I am still owed $750 dollars. The photos are two different contracts i had signed initially. One shows the price of one 4x4 window to be installed and the other shows the price of two 3x4 windows to be installed. I blacked out my personal info. The third photo shows they charged me for the 4x4 window then reimbursed me the incorrect amount.