This is just an estimate but Globe's Billing System most likely prorated your bill from Feb 3 (activation date) to Feb 5 (monthly cut-off date) based on the number of days or hours of usage.
Just to clarify, and assuming that my estate is correct, the P1,799 you initially paid would cover for your first bill's amount due which is P126.91. You will have an overage of P1,672.09 and this surplus can be used to partially pay for your next bill.
To have a better idea, call the 211 hotline or send a message to a Twitter Specialist.
Hopefully this is the correct computation. Will globe provide call and text message detail record for calls and texts I made on other network?