The transactions to/from the address you linked have been confirmed and cannot be reversed. If you click on the transaction IDs (e.g. cbbae668...), you will see the number of confirmations; currently in the thousands.

How can I recover my btc when davor is not responding?

You cannot. Davor owns those coins now, and any attempt to do anything with them will need their cooperation. All you can do is ask them to credit your account and/or refund their coins. You can ask politely, or rudely, or with the assistance of the legal system (i.e. try to sue them). But this is no longer a problem that can be solved via technology.