Insurance does not pay or much less after accident

I had an accident at the beginning of January. Unindebted, police were on the spot. There is no doubt about that. The evaluator had found a damage of 2400,- Euro net. The replacement value was indicated by the evaluator with 2700,- Euro. I definitely wanted to fictitiously calculate. The car was then repaired by me or with workshop again 100%. The costs (workshop, paint shop, parts etc.) amounted to approx. 900,- Euro, which I had already paid. After a long time, the insurance company probably needed the payment and calculates on a total damage basis, whereby the value of the insurance was fixed at 800,-. She had allegedly paid 675,- Euro, I still wait for the money. Apparently, the case officer once looked at Mobile. From 800,- Euro you can find the car, but also in a corresponding condition. I had already had the whole thing already an Anw He wants to wait for another letter from the insurance company, after that I will clarify it with him again. But first I would be interested in what the insurance company can afford or what is to me at all. Who had a similar situation and on what I have to prepare. Greeting Holger