Sounds like they installed "P" class and switched to "LT" class
Over at my Suburban forum...a member in Europe had his wife bring their 2500 Sub
in for tires
When he got home, checked that they installed 'P' class.
Took it back the next day and they changed it on the spot
Over there and in Japan...this kind of thing is enforced. If the wrong class
of component is installed...they will boot the vehicle spot on, fine/revoke the
dealer and even jail time if an accident occured
They also won't register the vehicle if improper components are installed
Wish we enforced these things better over here