Dissapointed in Nissan

I recently purchased a new Nissan x trail, 2015 Demo with 29000km. Before the purchase went through there were conditions I requested, I asked that the Bonnet be repaired from the few chip marks among others. Nissan agreed with my request and we proceeded with the transaction. Promising me that they would fix everything. After sending my new car in for FOUR times, i have received it back in worse condition than I originally received it. I am supposed to be a proud new Nissan owner, but all i feel since i received it back the first time, is regret! If this is the kind of after sales service that Nisan offers then they are in for a rude awakening. I don't even feel like sending it in again for fear of it coming back in even worse condition. I am truly disappointed with Nissan.