Claimed to be from Vodafone, thick Indian accent, very bad phone line, heaps of talking in the background. Warned me that they would be shutting down Vodafone services for 24 hours for "maintenance", then asked me for my account details so they can send me the update once "maintenance" is complete.

I hung up, then they called me back. I hung up again.

Very thick indian accent, bad phone line, and keep warn me about the 'maintenance' that gonna happen with my optus. She said the bad phone line is because there is a problem with my optus. She asked me about my detail, then I hung up.