hangs up when calls. 2 times now. on my cell phone.

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yes this has been happening thge past couple days they call and i answer they hang up. i call back nothiing happens. 2day i called back they said u reaches psi leave ur number if u want them to call back wtf?

They have called everyday for two weeks and I cannot get them to stop. Can anyone tell what they are saying before they hang up?

I have had3 calls from this number so far, they call, I answer, and they hang up...who are these people???