The first billing is always the problem as cashier and the billing and collection departments take some time to reconcile their records to the detriment of the subscriber which despite of Globe's supposed system enhancement was poorly or was nnot even addressed.
http://community.globe.com.ph/t5/user/viewprofilepage/user-id/32893@miufille rightly suggests that through the hotline, insist that you have already paid by giving your receipt number, when and where payment was made and be sure to get a reference number in case your line is cut (more often not) and dispute could be elevated to the proper channels.
In the same way that Globe has not or minimally addressed this concern, I strongly suggest that Globe include a letter accompanying the first bill an explanation on the following:
1. That advance payments and cashouts may not have been included yet pending on reconcilation of accounts (how long does Globe really reconcile figures?);
2. An explanation on the MRF specfically on the inclusion of the prorated charges (a common question and a source of irritation if not explained well based on the posts in this community);
3. An assurance that lines would not be suspended due to Globe's inefficiency in dealing with its reconcilation which has been happening for quite sometime now (my latest subscription of June 2012 was also affected and was only reconciled after 4 billing cycles).