At best, returning a scammer's call merely confirms your phone is "live", and your number will be added to a list that will be used by even more scammers. At worst, the call will cost you additional fees, if it is from a foreign country, such as Jamaica (876 area code). Also, scammers are now spoofing Caller IDs, so the number you see may not really be the number that called you. It might belong to an innocent, third party.
If you are disturbed by frequent calls from scammers / spammers. obtain a call blocker app, device, phone, or service. Google (or your favorite search engine) is your friend. Remember, the Do Not Call list is designed to prevent calls from legitimate, registered telemarketers, but scammers / spammers are not legitimate telemarketers, do not register, and they ignore the DNCL or your requests!
If you wish to report scam/spam phone calls to a government agency, look here:
http://phonehelp.2truth.com/complaint_sites.html
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