1. The number you see on your Caller ID may have been spoofed, and your return calls go to the wrong party - thus making you part of the problem rather than part of the answer.
2. If the scammers get irritated, they will add your number to the "call me often" list.
3. If they are sufficiently irritated, they will add your number to the "spoof" list, so YOU start getting calls from irate people, because YOUR number appears on their Caller ID!
4. In some cases, they spoof YOUR number, and call your local emergency services. That wastes the services' time, and will give you an unwanted surprise! (Google "Swatting")
5. In some cases, calling them gets autoforwarded to an overseas number, and your next phone bill will be a surprise.
Are those enough reasons?
They all are documented, here, on 800notes!
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Please reply to this post, to let us know you read it, or have taken suitable actions to protect yourself.