We have purchased our windows and doors through sl...

We have purchased our windows and doors through slack and sons both in the past during a remodel, and recently with our new addition. We told this company that we wanted windows for an addition. They sent us a bid that included the technical description of the windows... all jargon that made little sense to us. They delivered remodel windows for our new construction remodel. When we called and emailed them to try and return these windows for the correct ones, they accused us of lying and told us that an exchange was not possible. They offered that we pay them an additional $1200 to swap out the window frames. We will never use Slack and Sons again in the future. Their customer service is terrible.