Fiat 500 7000km and exhaust already rusted through???

Hello dear Fiat community, have confessed our Fiat 500 BJ 2008 to the first oil change. Then the friendly one that the exhaust is rusted and I need a new one told me. I get it new on Garntie, but what is that scrap, I need now every 7000km a new exhaust. And the best is still coming, I should also pay the rental car because the Mobi guarantee does not apply. So I find the outrageous of Fiat first they do not give any discounts and then they sell d Is there any similar cases here or am I here alone with this exhaust problem? Thank you for your answers! SammyD