Of course, it should be cancelled! IF the rule of law is still alive in this country, there is no way it won't be cancelled...
Not only he did not pay his taxes, not only he lied on his COC saying that he has never been condemned for any offense (both are grounds for COC cancellation), but, as if it was not enough already, he provided fake receipt to the COMELEC commission!!
This guy has no shame... but I guess it is just a strategy from the duterte to have him elected (by cheating) and then have his COC cancelled in order for sara to be president...
If this happens, I do hope that Filipinos will have the courage to stand anew and make their voice and will heard.