As far as I can see, the manager gave you the assurance that your normal rights of return begin again after the garage reopens. That is all well and good but for several obvious points. The fact you no longer want the car makes it more difficult. Unless you have a point of contact who is willing to open up and exchange vehicles and rectify the finances you are effectively in limbo until after lockdown. Even then, which could be weeks you will have used the car and increased the mileage, wear and tear etc, for which they may want recompense. Maybe after some thought you decide to keep the Golf, then of course the repairs can be carried out when the garage re-opens. At which point you insist the repairs are carried out by an approved VW repairer and not just a back street cheap operation and you want a written guarantee for the repairs in line with industry guidelines. In the meantime you could obtain three estimates for the work from approved workshops and submit those to the garage(if anyone is around) and they could pay that way. I suspect they will not want that and they have a favourite repairer who does their work. All in all I am afraid you are another hapless victim of circumstances and you will have to wait until later to sort it all out. It makes sense to go the down the repair route if you like the car, then you can use it until the time comes without worrying about mileage etc etc. You have a decision to make. Good luck.

Cheers Concrete