Water leakage house pipes inspection

Hello,

I had a water leakage in an underground pipe few months back and i got it tracked and fixed as soon as water appeared in my basement. However, I got a very high water invoice (running into thousands) post this incident. My insurance does not cover the water costs. And I have requested settlement with the water supply company and they want a certificate of inspection of all the interior pipes from a recognized body before negotiating any settlement. Can someone kindly advise the contact of a house water supply pipes inspection company which is recognized by the local government ? and any alternate way to address this thousands of euros invoice ? Thanks a lot in advance.