Have you tried both fobs? sounds to me like the button itself on the fob above the MBZ symbol for locking isn't working. You can take the key fob apart, and check the little buttons on the PCB / board itself for function. Sometimes they get stuck with dirt / grime to the point where the button itself under the plastic shell is not engaging.
SOURCE: Mercedes-Benz 320clk coupe 2002 with dead battery
Posotive can be found in hood driver side next to fuse box. It is a small rectangle box. You can hook negative to any solid ground on the car.
SOURCE: have mercedes E class key fob will not open doors,
If key will not turn
Car battery flat,charge or jump to activate elec ignition
SOURCE: c240 mercedes key wont turn seems locked
I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.
SOURCE: keys lock in trunk alarm will not allow trunk switch to lock
The solution is to pull out the back seat to get into the trunk. There are two bolts holding the bottom part of back seat (bolts located between bottom and top sections). Then pull out bottom section of back seat and you see the hinge for the top section, remove the bolts and then you can lift up and access the trunk. It's not that hard.
Do not panic but instead consider calling a dealer to avoid making any mistakes here.
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