Unsatisfactory 3rd party settlement

I put in a claim as a 3rd party with a quote from a company who I trust to do the work and provides me with complementary replacement transport. What does Outsurance do go and find some supplier they decide is fit to repair my car not willing to provide me with a replacement. Just because they willing to do the repairs for them for less. I wouldn't ever take my car there besides the customer service I received at the company they wanted to do the repairs leaves a lot to be desired. So what if I had an issue with the repairs when it's done where would that leave me. Needless to say it's my car not outsurances I didn't ride into myself there customer did and so why so I have them decide who must do it and be without transport for 2 weeks not be able to get to work 40kms from.where I live. Just ridiculous. Cheap and nasty that's the normal saying. Then of I don't want there repairer I must pay in the difference. Seriously.