Help! Door u trunk also mechanically no longer open

Hi, I drive a R230 with Keyless Go. So far I have been blindly relying on the ZV. Since the rear battery has always struggled I have pulled both cables from the poles. Purchaser compartment lids too. Problem: the ZV has no juice, the mechanical key turns the lock however the handle to open no longer has any function. Now the Supergau! ZV has no juice so still take the key and open the driver door with it. Key goes by 2mm not so deep in d The lock locks. With greater effort (tongs) it doesn’t turn, but it doesn’t happen. MB has no idea again. They don’t understand even that with the trunk. The ADAC said breaking up with damage is the only way. Really??? Thanks in advance for the help