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You need to stop starting the car only once a month. We have no way to tell what's going on if the car has sat for that long.
Take the car for a drive. A fairly long drive. Let it sit overnight and see if the dead battery problem persists. If so, then you may have a key-off drain. This takes some patience to track down. You'll have to begin pulling fuses to locate the culprit circuit. Also, while the car is parked, pop the hood and listen for the ABS pump or other devices that might be running.
Also, once this is sorted out, start driving the car. 60,000 miles for that age of car is not good. Mercedes' thrive on being driven and you're not doing the car any favours by letting it sit.
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