It’s entirely up to you if you cancelt. Whils’t there has been some reduction in AP’s no one knows yet wheter they will continue to fall or not.
I don’t know the answer for the chargher you have had installed. I would double check what costs if any are involved in removing the charger by Mb or whether Mb will charge you to install another charger in the future, should you decide to have an EV.
It could be the case you are offered the facelift model at the original AP you paid but, again I’d check this with Mb or the dealership.
What EVdid you order?