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Hi @Sewoong , sorry to hear you've experienced some long wait times trying to reach us on the phone!
If you just need to cancel your service, there's no need to wait on hold. Just grab the AGL app or log in to your My Account page and send us a message to let the team know you want to cancel. It's not live chat so you don't need to wait around for a reply. Just check back later or wait until you receive a notification from the app.
By the way, this is a public community so I've removed your personal details from your post for your security.