I really feel for you as I
I really feel for you as I think you have been given a bit of a run around. The following statement comes from the BMW website.
"How long can I drive on a deflated Run-flat Tyre? This depends on the amount of people travelling in the vehicle and if the boot is fully loaded:
• With low loads, one or two persons without luggage:
Approximately 240 kilometres at a maximum speed of 80km/h
• With moderate loads, two persons with full luggage or four persons without luggage:
Approximately 145 kilometres at a maximum speed of 80km/h
• With a full load, while towing a trailer or four persons or more with full luggage:
Approximately 48 kilometres at a maximum speed of 80km/h"
Based on the above, you should have been able to drive to your dealer.
As for repairs. In the past, all damaged RFT's had to be replaced but some makers are changing that. I have Bridgestone S001 on my 3 series and they can be repaired (nails and screws type of damage). Not sure what others are doing.