I think you have 4 options:
Recharge on a granny overnight, though not recommended if having to charge regularly or forever.
Do you have any public fast chargers (50kw) locally that you could use, some of these are free in Scotland. I think I heard from a VW dealer that if you can’t get a meter fitted Motability have been know to give out cards to get free charging (but check).
Take the car and wait until smart meters are available to be installed and then get the supply upgraded and in the meantime do one of the first two options.
Or failing all that cancel the car which would be a catastrophe.
What a terrible situation to find yourself in☹