The regular way to purchased DLC on pc is to do it via the Microsoft store, and the mitsubishi car pack is no where to be found. There’s also the option to purchase it from ingame but that just opens a Microsoft Store menu and as you can see from my video is glitched and doesn’t work.
I play on Xbox One X - not had any issues with it but just wondering if you have any updates to the game that need installing. Having done a bit of searching around, the mitsubishi pack wasn’t exactly a DLC it was part of a game update, which added those cars to the game.
Not sure if that’s any help at all - what did support actually say in their generic reply?