sounds like abit of waffle, Truth is you trading a car in for one you leasing via mb and i reckon you’d get more if you sell it privately as it’s 9 years old and they won’t sell it on their lot..
so them sending it to auction sounds about right.. how much will wbac give you (not that i’d use them) offered £40 years ago for a car i sold for £450 myself.. but might give an idea of the lowest price..
I never heard of them selling it then aftercgiving you money sound like they don’t want to say they don’t want it.. unless you give it to them and they can deffo make there money back easy..