Door Latch problems of the 1999 Mercury Sable

The incident I am writing about relates to the electric door locks on the 1999 Mercury Sable. After many months of having passenger side door locks not responding to the driver or passenger side controls, I took the car in for repairs to my local mechanic. $450 later the mechanic was able to replace the problem parts with the statement that Mercury was having a lot of problems with this series of locking mechanism's and it appeared Mercury had a wide spread, pervasive problem. I consider this an unsafe condition as it prevents the driver from insuring that all doors are locked when transporting young children without the driver exiting the vehicle or crawling across to the opposite side to lock the passenger side doors. What can be done to track this problem and how can Mercury be required to consider this a recall issue and take steps to correct and replace the door locking mechanism?.