Sorry man. As you said it’s been an expensive lesson learned, one you will not forget.
My first experience with a BMW was an e21 320i. It felt so fast and cornered unbelievably well compared to my 1988 Honda Civic. Then it was an e30 325e and then followed up with 11 more BMWs. I’ve had not one major issue with all of the BMWs I owned/own so my point is you’ve had an unlucky experience with your 1st BMW and the chance of that happening again is pretty low. I hope they sort out the issue(s) and you can continue to enjoy your 116d until it’s time for your 2nd much more reliable BMW
