Workshop binding

Hello, I had an accident (self-debt) on Friday. For my car (Volvo 2.25 years old) I have a comprehensive insurance with 300 Euro SB and Wekstatt binding. The insurance has called me a partner company (Wekstatt) which is not a Volvo workshop. Question: If this partner company repairs the car has any negative effects on my guarantee? I have completed a connection guarantee for the Volvo (3-5 years). Can also the warranty on rusting be satisfied on the Internet I have also found various places that write that the workshop bindings are legally located in the insurance companies aif thin ice! For your helpful answers in advance thank you very much.