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Penfield Service Center
Has a technician physically got in the car with you for a test drive? Sometimes another Mercedes dealer will be willing to put forth a better effort.
Check the wire harness under the seat 1st. They often crack or break with age
The cluster has most likely gone bad. They can be repaired. Check the internet as many blogs will appear. See a good local repair shop to have it sent out for repair
The question is Is it a crank no start or it cranks and does not start?
It is most likely a "fuse" . Take a picture and head to the dealer with your VIN number. They will get you the correct part. You may have to remove the fuse box to replace it from underneath. Question is - What BLEW it and what is there rt now that protects the circuit? Careful of your JURY RIG
Check for blown main fuses as most THIEVES tend not to be to careful and may have ground something taking the battery
2 Things- Fuel Pressure and look at 02 sensors pulling lean. Check backpressure in exhaust.
A professional diagnosis using Mode 6 information will aid in your issue. This is a section of information that can be seen with a professional scan tool. It may help in seeing a misfire or coil degradation.Codes are not always the ultimate solution. Another simple test is to use a light mist of water over the coils and look for arching of electricity.