Other Fuel System Fuel Injection System problems of the 2012 Volkswagen Jetta

My first concern is the seat belt warning light will not stop making an alarm noise. My seat belt is plugged in, and the alarm will not stop and the dashboard views it as un plugged as well. Clearly, it was plugged in. I tried to take it out, inserting it back in slow and fast. Neither was acknowledged by the system. Am I even safe??? second, there is some sort of delay while driving. I just purchased the car in December 2015. In March 2016, the car has some sort of delay while I'm driving. Not during deceleration or acceleration. But in the 40 -50 mph range. I realize, maybe it has something to do with the turbo injection. It has started happening again sporadically a month later. . . . ??? please help with clarity on this issue. Is there fuel injection issues with tdi? okw.

Vehicle engine (jetta 2. 0 tdi) abruptly stalled and would not restart. The dealer stated that the high pressure fuel pump had failed; and had disintegrated in a fashion that the debris had contaminated the entire fuel system. Fuel tank, lines and injection system were cleaned, fuel pump and filters were replaced. However, the vehicle has still experienced intermittent stalling problems ever since this warranty repair, and the dealer has been unable to resolve after numerous attempts. The vehicle has been (and currently remains) at the dealer for 33 of the past 40 days.