Other Fuel System Tank Mounting problems of the 2012 Mercedes Benz C300

Feul tank leak when I put any amount of gas into car it is leaking out on to the ground while im driving and when im at a standstill. The smell is very strong and I see the trail in my rearview mirror. I read on the website that is one of the problems that this car is having it was reported March 2013 but when I call the dealership they are telling it is not a recall for this vehicle. I went to autozone to do a check and it told it was the feul capped which I switch and that was not the problem. Now I went to do my inspection and it failed due to this problem.