That's really incovenience on your part. So sad to say but you really need to get the updated version of SIM card which is the 64K. On that way, your GCASH will work on your BPI MOBILE Banking. So your option is to find another Globe store, or you can just dial globe customer service and ask the store number to verify if they have available sim. On that way , your effort in going to the store will not be wasted.