Total damage – insurance does not pay the full amount!

Hello… I had an accident without fault and now have problems with the opposing insurance! According to the report of the Dekra, the following values were determined: Reperature costs: approx. 3000 € Replacement value: 2.200 € Remaining value: 700 Type of damage: Liability damage! thus a total damage! The insurance, however, has not adhered to the residual value of the dekra and has caught up with a residual value of 1250 ,- (a car dealer from berlin) I was totally annoyed and white einfac h no more! They tell me it’s all right on the phone, but I see it differently! They want to fool me in a way! Dekra told me the residual value has to be collected regionally (up to approx. 200km)! The residual value of the VGH (1250) however is supraregional and may not be used! Yes and now I stand stupidly there…what should I do? Has someone already had experience and can possibly help me? Unfortunately, have no legal protection insurance for a n lawyer to turn on, he can cost me a lot mfg