Needed advice from the experienced paintmaker!

I had bought a Fiat 500S 4 months ago, at the back of the trunk handle the paint is scoured, I was of course very enthusiastic about a new car with 5km and then immediately repair, because the car dealer did not take the car back. Now they returned the car to me yesterday and under the paint are like sand grains or bubbles. I immediately made the car dealer aware that there are small bubbles in the paint. e Reply I have to let the paint rest for 8-10 days and the paintr can allegedly grind it away. Can you really grind it on the paint? I’m afraid that I have problems with it later, wanted to keep the car a few years ago is not even a year old. Did he do his job well? I have a few pictures with uploaded of these bubbles/grains are about 30 pieces available. I can’t imagine that this can be something. Please for help