Kindly review first your billing statement and check saan galeng yung 2412 for sure meron jan nakaindicate. I always call the hotline tuwing may hindi ako maintindihan sa bill ko lalo na yung nakakashock.
The Samsung Galaxy S duos is currently offered with 2,400Php cash-out for plan 499 but is chargable to bill for 24-months at 100Php/mo. The Huawei G510 on the other hand is offered for free on the same plan. See your Mobile Subscriber Agreement form for clarifications on your purchase
If that is a promo to the globestore make sure to give the full details when you call the hotline since they will be the one to validate it to the globestore if the handset has a cashout because if im not mistaken some handsets at the globe store has discounts during caravan.