Smart Convertible Range

THEY have a basic responsibility to deliver a professional service, and it seems they haven't. You should complain to the company so they can take action to make sure it doesnt happen again. If that doesn't satisfy you, find out if they're a member of a trade organisation and make your concerns known to that body. You could also report your problem to the manufacturer/distributor of GT Radial tyres so they can take action. Finally, go to your state consumer affairs people and lodge a complaint.