You need special Kalkhoff equipment to find out what current has been programmed. Only Kalkhoff dealers would have that, and I doubt any of them would tell you what's been done - and I doubt that they even know what the parameters are in the new software version. They just plug in and load a new software version.
The only way you can find out is to remove the motor to get access to the battery wires. You'd then have to adapt them and put a wattmeter between the battery and motor.
If you have good fabrication skills, you could make an adapter so that you could mount your battery remotely temporarily, say on a rack, while you measure the current down the wires with a wattmeter. Basically, you need something that at one end will fit onto the pins sticking up out of your bike and at the other end some pins that fit into the battery.
I don't believe that you need any of this. I think it should be enough to say that you reject the bike as it now is because it has insufficient power for your needs, it has significantly less power than when you bought it and you bought it on the basis of its high torque, which it doesn't have anymore. Anybody should be able to understand that.
