Just to clarify... Globe does not have any signal except in the Philippines... What they do have however are roaming agreements with different telcos which provide mobile services in their respective countries.
If the issue is not account related (over credit/spending limit) then it could be that roaming technical issues whether Globe is at fault or its roaming partner/s could be the problem.
Remember that telcos in other countries prioritize their own subscribers rather than roaming subscribers when it comes to servicing tiers.
If you need to do some online banking then I know that some Philippine banks (like BDO and Citibank) have secret questions rather than OTPs to address these kinds of problems. This feature was integrated due to the technical problems like roaming (when SMS would be delayed for technical and roaming issues) and loss of sim or unavailable mobile signals. .