What is Number phone 615803923 And +43 800 640338?

I have a question is Number phone 615803923 And +43 800 640338.
– Who is the owner of the phone number.. They call me constantly every day at 2021-11-26 11:32:58

Can someone tell me what to do with 615803923 And +43 800 640338 ?

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Recent, Comment at 2021-11-26 11:32:58 by anonymous : Blinks