2021 Volkswagen Atlas Chest Clip Buckle Harness Problems

What component or system failed or malfunctioned, and is it available for inspection upon request? I feel that the straps are faulty and have been for some time. I tried to follow up with Nuna directly and was not successful as apparently a carseat that was purchased in 2021 is out of their warranty (yet kids should be in carseats for a VERY long time). The carseat is available upon request for inspection. I cannot get a tight pull on the crotch pull to make the straps tight on my child. They seem to always feel loose and such a struggle to pull the strap. The straps feels as though they have lost their "taught-ness" and are loosy goosey just feeling. How was the child’s safety put at risk? I don't feel the straps are tight enough to his body to keep him safe in the event of an accident. I can't get the pull strap to budge, it feels stuck or broken inside and you cant get to it at all. Has the car seat been inspected by the manufacturer, police, insurance representatives or others? I had filed a report with Nuna but they were unable to do anything because of the warranty no longer being valid.