The thing about this forum is that anything you write is documented for everyone to see and unless deleted by the moderator, it stays there. You are not the only one who has experienced this... even I have experienced this a couple of times and I would not know if they do it intentionally or the line was just cut due to a technical mulfunction.
Nevertheless several of us have already suggested that the least that the CSR could do is to call back their customer since the caller's number would appear in their system. It is quite frustrating calling back and hearing a lot of options before being connected only after around 10 to 15 minutes and re-explaining one's concern from the very beginning since the person you would talk to would not be the same person you have spoken to previously.
We hope Globe would take this in stride to improve their customer service.
The best option for this concern is onset of the call ask for a callback if ever the call was disconnected.
@ryeza27 - you can call the hotline and file a complaint to be investigated for that incident.
Hope this helps,