I reported an accident to the Police once using the mobile number I had uneventfully used for the past 15 years (at the time).
Few weeks later I was pestered at least once a day by claims firms.
I usually got through the robo-call section then when put through to the human agree to everything they say and explain all the injuries I've suffered and time taken off work to recover.
Towards the end of the questioning I ask if it matters that I was over the legal drunk driving limit or that my car only had three wheels at the time.
Contacts drop off dramatically after a few calls like that.