Howdy Precious Diaz!
Just to be clear, once a postpaid account has been activate it will continue to accumulate bills regardless of whether or not the services were actually used. And "alam ko ma teterminate ang account pag 2months ka ng hindi nag babayad" is not entirely accurate, as unpaid accounts are temporarily disconnected until you've settled your outstanding balance, and again will continue to accumulate during this period.
If you wish to stop receiving bills completely, then you need to request for your plan to be permanently disconnected. To request for permanent disconnection, all outstanding balances must be cleared.
Hope this clears things up. Cheers.