Thanks all for your replies. The alleged incident occurred during our time abroad.
Car was parked on the street near our flat.
Our insurance company only said they were contacted by another insurance about this, and we denied involvement. They said they are now waiting for the other insurance to disclose proof of our car’s involvement.
We will send the info to the police and proof of flights (we have asked the airline for additional proof that we boarded the flights, and we have pictures abroad on the day of the alleged incident).
I don’t think the date is incorrect because the police and the insurance company have reported the same date.
Thank you again for your help. Definitely one of the options mentioned happened, we just hope to be able to prove that our car was not involved - we can prove that we were not, but without CCTV I’m not sure how to prove our car was were we think it was.