Hello! I'm sorry to hear that your relatives have been contacted by this number. Based on the information you provided, it sounds like a potential loan scam. Scammers often use tactics like this to intimidate people into paying them money for loans that don't actually exist.
It's important to advise your relatives not to engage with the caller or provide any personal information or payment details. They should also report the number to the appropriate authorities or their mobile service provider to help prevent others from falling victim to this scam.
If you have any other questions or concerns, feel free to let me know. I'm here to help!