Tyre makers typically replace their tyres every three years or so and you can run into problems like you have with your Laguna. You could buy one tyre of the new type to replace the punctured tyre, and legally run it on the rear. You could also fit the new tyre to the spare and fit the original spare to the car.

THE trade says the front tyres on a front-wheel-drive car wear two to three times as fast as the rear tyres, and the wear rate can be higher in a heavy front-wheel-drive car like the Laguna. At that rate you would normally expect to get 20,000-30,000km out of the front tyres and 50,000-60,000km out of the rears. On what you say it seems as though wear rate is about normal as the tyre dealer told you.