Caller: A web development company

They found my contact details on my DNS registry entry, and cold called me to ask if they could help me with my Web development needs.
They didn't leave a message, but did answer when I called back, and they explained why they had called.
I said I didn't need their help, and left it at that. No evil detected, but was unsolicited

Some person about my domain name having an issue, the problem is that I do not have a domain name

Caller: Scam

Told me my domain was expiring and I had to register it with them, tried to get my credit card number

Had a missed call from this number, tried to call back as it was a local number but said line was busy so I looked it up. Will block now that I see it's a scammer.

Someone called to discuss my website at around 7pm - even though in black & white on my website next to my number, it states "SMS only". Unsolicited call.

Caller: Indian telemarketer

Hung up on her, selling SEO

Caller: Claimed to be a domain registry

Called and said my domain name had expired, and I had to pay immediately by credit card to stop it being taken over by someone else. Total scam trying to scare people into paying up for a non existent service. 2 simple things gave it away. 1. My domain names were only renewed for another 2 years recently, in November, with the same company I’ve used for 20 years. 2. When I asked which one of domain names was the problem, they couldn’t tell me any of my registered domains!

Phone said "unknown caller" but (07) 3520 4325 showed up. No one spoke. Creepy.

No one talked when I answered

Yep. Using stolen data they targeted a domain name I lease. Scammers.

Caller: domain company

clearly got my number from the optus hack

Someone calling about a problem with my domain name, I don't have a domain name