Hi Donald,
This is truly shocking service and I really feel it for you. I honestly don’t know how dealers think they can get away with this. Do they think we are stupid? The sad thing here is that any complaint to the dealer principal (main manager) may fall of deaf ears as he/she will probably have authorised the sale of your car to a private customer while chasing sales.
My suggestion would be to complain to Mercedes UK via email and social media (ask friends and/or family if you do not use it) and quoting your order number and promise date. Try to keep it brief but include the main points, including the point about Brexit!
Also, please make sure Motability are aware via email. We should all do this if it happens to us so they can see how often this happens to their customers. In no way is this Motability’s fault but I’m sure they’d want to know and may decide to add some leverage by rollocking the dealer.
So there we go folks. The answer to the post title? Six months and counting.
Good luck sir and please keep us posted.
? I will be remembered for nothing but had great fun doing it ?