Do a search for " Broken Key Extractor " this is a thin barbed / hook looking device that snags the key.

Some have tried super glue but I wouldn't as that can make more of a mess.

Don't hammer or drill, this will make it more difficult for the lock smith to fix.

Your car will have DAS X anti theft so there will be a chip in the key that needs to match the DAS box and engine computer. Plain short headed " flat" keys are ~ $ 40 at a MB dealer , flip remote keys are more in the $ 160 range.