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Hi,
It maybe that the 12volt battery in the boot is low/faulty. It seems that they only have a 2 to 3 year life span before needing replacing, or at least testing for state of charge.
A low 12volt battery can cause the issues you seem to be having along with other problems. Just research the forum for more info.
The actual key blade on the key fob should be able to get you into the driver's door and then you can open the bonnet and attach a jump pack or jump leads to the terminals in the engine bay.
Maybe this will give the car enough voltage to power on and start up. If so you should consider getting a new AMG battery.
Good luck.
Steve.
 

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Hi,
Just clutching at straws here, are all the other doors and boot fully shut and not half latched? Might interfere with the central locking.
Are the batteries in the key fobs ok?
If there wasn't a green charging light when you had the car plugged in could that be a related issue?
 
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