My case susah.

Need advise.

My car kena bang n knock by motor rempit which most probably trying to rob me.

Now I claim insurance with the police report but

1) the plate number use by motor is fake number
2) obviously another party does not make police report

The problem now is workshop panel say most probably I'll lose NCD as regardless it's my fault or not as my report stated that another party is using motor.

Is that correct statement by them?