Most likely its GOING TO BE A ***** TO FIX My fathers 300 SD did the same thing about a month ago. He tried cutting it with every damn bit and dremel moto dool device he had. It didn't move a bit. Don't bother trying yourself. We just paid a locksmith 155$ for about 3 hours of work and he did it. The guy's quoted Mercedes, BMW and Volvo locks as the "Fort Knox" of cars.
"Damn the torpedos, four bells full speed ahead"
-1987 300E Smoke Silver
-1997 S320 Black on Black
-Soon To be E55 AMG
-27 foot Grady White Offshore Sportfish.