Faulty installation, refuses to accept responsibility

I guess I just got lucky when James' team installed my first wendy – no complaints there. However, the second wendy installation a year later has left me completely dissatisfied and very angry. They completely failed to level it correctly on level, firm ground and installed the window in the wrong place. James now refuses to accept responsibility to replace the incorrect window panel and insists I accept that they breakdown the wendy and reuse the then damaged components again to fix the leveling instead of replacing them with new ones. So, if you use him, just hope like hell you're one of the lucky ones, because he certainly won't take responsibility for his or his team's ***** ups and sloppiness.