After a year, my Alfa is still not fixed

Good day,<br> <br> I am now on my second Alfa Guilietta Distinctive, after my first Alfa Romeo Progression saved my life in an accident, I will be hoping to upgrade to the Giulia soon, but am experiencing an immense amount of pain with my existing Alfa.<br> After a year of this problem, Alfa Service can STILL NOT resolve the issue. The vehicle has been in almost every month for the last year, changing every possible part and running every possible test and still my car is running terribly!<br> The car shudders and shakes when I accelerate, it feels as though the car is starved of fuel or air and it NEVER accelerates properly, even at overtaking speeds. When I try drive with the aircon on, its 10x worse, with the car having such enormous drop in power that I have to change down... something that is so embarrassing when I have to cart clients, employees and friends, I ask if we can rather take their car now!<br> Like I have mentioned before, Alfa service is getting nowhere, its almost exactly a year and I really am so tired of having such an uncomfortable unpleasant driving experience, that I would prefer if Alfa just took the car and gave me a Fiat or something else...<br> Please please please ca