the battery is totally flat, the boot is not opening, tried to open it with key not working, I managed to open the car door and tried everything else i could to get the boot opened and car started but NO hope. I have been told there is no electric point to jumpstart the car.
Any other suggestions please..........................
there is NO electric terminal under the bonnet to Jumpstart the car

The only way to easily get into the trunk is with the emergency key. But since you mentioned you cannot turn the trunk tumbler, you have to break into the trunk ( I'm assuming your CLK does not have the optional folding seats? ). I suggest calling up a tow truck and taking your car to your Benz or other preferred shop.

Why do you need a point use the battery terminals.