Said I had won 5K said to answer with yes or no answer I hung up and called back not able to get through no does not exist.

When you call the number bac an american message says the cell tht you are calling isnot inservice. My suggestion is block the number

Immediately hangs up after answering.
Likely a bait call to test if your number is valid.

Rang didn't leave a message.

Caller: Brand Selectors

Advised me that I had entered an online competition and could now go into another draw to win $5K if I answer yes or no to some questions over the phone. Said no to answering the questions and asked for my phone number to be removed from their telephone survey purposes.