Nuisance callers. Never leave messages and disconnected message when you try to call back

As above - always missed calls - no message

Keeps ringing & hangs up when I answer. What do they want !!

After hours call. No message

Called asking to speak to a fellow co worker, sounded very much like it was going to be a sales call so i asked if i could get my co worker to call back but the person on the phone avoided and just said they'll try again later... no idea where they were from but the lady had a foreign accent

number not connected when called back.

called number back number disconnected they left voice message in south Asian voice laughter.

Answered call and got hang up on called this number back and got a recorded message saying number was disconnected

It is some call center in Philippines and they are creating their database of company name and number

Answered the call, it was from an foreign sounding lady. She said hello, and asked me to repeat my name and company, then acted like there was a bad connection and hung up.
Possible scammers.

called back and get recorded message saying number not connected