besides having a dash cam, or using your cellphone to record events after the supposed accident...
pag dating sa police station unahan nyo na. use what they are trying to use on you, shock tactics. kasi pag ikaw ang naunang natakot yari ka na, ubos laman ng wallet mo baka pagwidrawhin ka pa sa atm. as soon as you are in the police station go straight to the desk officer or duty officer and announce, in a voice heard by the traffic enforcer and the "complainant" that you are filing a case of extortion. pahuli mo na din agad pareho at sabihin mo sa duty officer na tutuluyan mo ng kaso. also, make it very clear that they will not get 1 single cent from you. say "magdemanda na lang kayo tutal padating naman na abogado ko e", or use the insurance tactic "may insurance ako, yung insurance ko ang kausapin nyo." you'll see them disappear one by one starting with the te.