876-495-9457

Some company trying to tell me I have won some nonsensical sweepstakes.

I've told these people repeatedly to take me off their call list. I've even spoken to a 'supervisor', apparently to no effect.

You will never be removed from these Jamaican scammers call lists.  The best thing to do is simply ignore all calls from the 876 area code and never call them back or any 876 number given to you or you will be charged International Long Distance rates.

Do not ignore, report!
Project JOLT is still actively finding, arresting, and prosecuting the Jamaican offenders:
https://800notes.com/forum/ta-8476d8cae08c200 ... -bites-the-dust

DO NOT return the call from someone calling from a 876 area code.
This is not a toll free "800" number, it is the international long distance code for the island nation of Jamaica. You are charged international and long distance rates for calling this number. Other international/long distance area codes are 809, 284, and 649.
http://www.att.net/smartcontrols-809AreaCode

Scammers use these numbers to not only try to scam you out of money, but also sting you with high phone call rates.
http://www.consumer.ftc.gov/articles/0119-jam ... ng-us-consumers
http://www.dhs.gov/news/2013/03/13/written-te ... 2%80%9C876-scam