Window Mart review: So disappointed

If you are considering using this company, prepare yourself to be present during the installation to oversee the shortfalls and quick fixes that are used on the contract you are paying for.
Very disappointed in the lack of responsibility that this company has taken for the mess they have created for us.

Initially installation looks like a good job. But later in the year when we began building the deck off of the new patio doors the installed for us, we saw how they were installed improperly. The patio doors were installed too high with a 2x4 placed underneath. This creates a tripping hazard entering and exiting the house to the deck. As we continued around the house to prepare for new siding, we realize the kitchen window would also need to be reset as the window was set out too far.
We contracted this company to do 3 houses for us, and our deeply concerned as to what kind of workmanship we will find on the other 2 once we begin residing them.
We reached out to the company and there solution below was that we should pay more to have them correct the shoddy workmanship they created.

Hope you are doing well.
After discussion with our Installation Manager, we would like to confirm that, from our point of view, we do not see any deficiencies with the patio door installation. Unfortunately, because of this, we are unable to address the issue under warranty.
As a possible solution, we can lower the level of the patio door and build up the area above the door to fill the gap.
The cost for this work would be $550 + GST if our installation crew is already working in your area. If urgent installation is required and the crew needs to travel from Edmonton specifically for this service, an additional service call charge of $350 + GST would apply.
Please let me know if you would like to proceed.
Thank you and have a good day!

For some reason I am unable to add photos :(