I got to access a random PLDT modem today -- the DNS of my server didn't update, and it still have the old IP -- unfortunately, another subscriber snagged that IP, and when I tried to access my server, it resolved to that said IP
the worse part -- it still has 1234 default password -- I got in, and got the phone number (on the voip setting), it was on route-mode with a public IP - I'm not sure if this was PLDT's default config or the user changed the setting (it was on vlan1039)
so... yeah, try to secure your modem, check if your external IP had access to the modem