I hope you bought it Certified Pre-Owned, else you won't have much warranty to worry about soon!

Wear and tear items/Maintenence, such as alignment, are not covered. If you just bought it, the dealer does have leeway to eat a good-will repair.

They SHOULD address this. Ask to speak to the service manager. Be very polite but be direct. Also let him know this is your first MB (is it?) and you would like a reason to buy many more.

All this ASSUMES you bought it from the MB dealer. If not, you are on your own for this minor issue, and after 50k, every big headache which you will certainly experience from time to time.