2013 Audi A5 FUEL/PROPULSION SYSTEM

I JUST HAD MY FUEL DOOR ACTUATOR REPLACED ON MY 2013 AUDI A5 WITH LESS THAN 44,500 MILES ON IT IN SEPTEMBER 2018. I AM HAVING A VERY DIFFICULT TIME UNDERSTANDING WHY MY FUEL DOOR ACTUATOR NEEDED TO BE REPLACE WITH SO LOW MILEAGE. THE CAR HAS A RANGE OF 455 MILES AFTER A FILL UP THE PART COST $405.85 INCLUDING A SHIPPING CHARGE. THIS MEANS IT COST ME $4.17 TO OPEN AND CLOSE THE LID AFTER A FILL UP. MY ARGUMENT IS THAT THE PART WAS DEFECTIVE AND IT SHOULD BE REPLACED FOR FREE. I SENT THE PART BACK TO AUDI FOR REVIEW. AUDI DECLINE TO ACCEPT RESPONSIBLITY FOR THE DEFECTIVE PART. HOWEVER, I AM NOT FINISH WITH THIS CASE. I SENT AND EMAIL TO THE CEO OF VOLKSWAGEN IN NORTH AMERICA AND GERMANY IN REGARD TO THIS ISSUE. I AM WAITING FOR A REPLY I WOULD LIKE TO KNOW IF OTHER PEOPLE HAVING THE SAME PROBLEM WITH THEIR CAR OVER THIS ISSUE. IN ADDICTION, MY CAR HAS BEEN RECALLED FOR WATER PUMP ISSUES AS WELL. I HAVE HAD TO REPLACE THE WATER PUMP THREE TIMES. THE CAR IS BEING RECALLED AGAIN IN REGARD TO THE WATER PUMP. THE WORK TO REPAIR IT REQUIRES IT TO BE DONE IN TWO STAGES. THIS MEANS FIVE WATER PUMP ISSUES. WHEN DOES A RECALL BECOME EXCESSIVE OVER THE SAME ISSUE. THIS IS NONSENSE!