Japanese telephone number reading

So I am taking a class on the Japanese language and am stuck on this audio question. The question wants me to listen to a piece of audio (which is someone stating a telephone number)

The audio is as follows

denwa bangoo wa san go ni san kyu ni ichi go hachiji desu

What do you type that as in numeric. I'm just confused on the ast part. He says hachiji but doesn't that mean 8:00 o'clock? Would I type that in as 800?

Are you sure you have “hachiji desu” in there? Could that possibly be:
- Hachi ichi desu
Or
- Ban desu (the number is…)

"Hachiji," meaning "eight o'clock," only refers to the time, so no, it wouldn't be used to mean the number 800.

「The audio is as follows
denwa bangoo wa san go ni san kyu ni ichi go hachiji desu」

I think you're mishearing the "hachiji" part. Given the context of the sentence, it should have a strig of numbers followed by 「desu」 and then end. "Hachiji" wouldn't fit in terms of grammar or meaning, so I think you're probably mishearing "hachi ichi" or "hachi ni" as "hachiji."

It turns out yes, I was mishearing it. The problem was my computer audio being bad and the dude saying it so dang fast. It literally sounded like hachiji.

Appreciate you guys.