As far as i know, they will open a file to investigate all suspected fraud transactions you reported, and won't clear the amount of those transactions till they finish the investigation (you will be asked to sign a statement claiming not executing those transactions). However, since the amount invovled in my case is much less than yours, i had been spared the hassle of handling the BPNI tax and a big amount of interest. I assume you can try to talk yourself out of paying those with PC? Maybe a threat of drpping their card will work?