I got a call from 951-783-1701 didn't answer, unknown number to me, and no message was left. Now it looks suspicious because 10 days ago I got a call from very similar number ending in 2, 951-783-1702. Same thing didn't answer and no message was left. Most likely unwanted call (spam, telemarketing, scam, you name it.)
They have called multiple times. Finally I answered and said hello and I got no immediate answer until punched the numbers on my phone making a lot of noise for them to deal with and a lady started yelling telling me to stop hurting her ears and I'm going to cause injury to her, I hung up and didn't speak to anyone. I'm guessing a spam call just due to them not saying anything when I picked up right away...and they always call and leave no messages.
Not buying your "story", pressing a bunch of buttons will annoy them maybe, but won't hurt anyone's ears. You can stop this number from calling by blocking it and you won't have to 'deal' with an empty call again.