This been shared by a lot of forums, it is a VW polo sedan. The problem is how many person got this patient and money to wait & sue for so many years. The car almost 3 years unable to use, if 1 or 2 months no feedback from current SC for sure i gonna tow to other authorize SC to settle or there is some story behind this owner with the SC dealer.

Actually not all VW is that bad, this case i believe there is something between the owner and the car dealer.

I have 2 friends driving the polo sedan 1.6 N/A series. Until today only do normal maintenance with the SC.
The gearbox is the standard 6-speed Aisin Automatic version, they feedback to me not much issue with that variant compare to turbo with DSG gearbox.

If the current SC you went cannot settle your issue, just went to other authorize VW SC to help settle since all are link to VW Malaysia.
Certain SC the technician might be too low par to identify the problem, if they cant settle your issue within few week times is time to move on to other SC or went for outside independent VW specialist mechanic.

Bro, what Mazda car model? I think the problem might be just simple like drive shalf as not balanced drive shalf can also cause vibration on high speed. Better go out and get other mechanic opinion. I believe Mazda fb or forum group does got a lot of mechanic to intro.

Once you signed is your own fault de. You must demand the car dealer to replace before sign off.