What is Number phone 840300524 And +4721504000?

Can I ask a question is Phone Number 840300524 And +4721504000.
– Who is the owner of the phone number.. Why do they call me constantly at 2021-11-19 16:10:04

Can someone tell me what to do with 840300524 And +4721504000 ?

22
Thank you very much
Recent, Review at 2021-11-19 16:10:04 by anonymous : How to block spam calls on iPhone