Legal complaint - Consumer Complaint for Globe Telecom

How can I file a legal complaint against globe? During this pandemic, I thought it would give me convenience and peace of mind that I can take care of this online. Since October, they provide nothing but stress. Now, the biggest concern I have is the first bill. Where I am seeing more than 24k bill even though my plan is only P799. I want to return this phone and get a refund. I dont want to deal ever with them.