How to stop persistent spam callers

Given my phone's settings, which block unknown numbers to avoid spam, it's concerning that this number has managed to leave me a disturbing voicemail on multiple occasions, and I would advise others to exercise caution.

I have my phone set up to block all unknown numbers, but this number keeps leaving me creepy voicemails, dont know if this person is dangerous or just playing a prank, but be carefull, people can get your location from talking to you on the phone

Given my phone's setting to block unknown numbers due to a dislike for spam calls, it was alarming when this number managed to leave a disturbing voicemail on multiple occasions, raising concerns about the caller's intentions.

This number displayed as private and unknown, claiming to be from a petitioners office and the US fraud department, yet the call back number is unverifiable on Google.

This number called as private unknown, then claimed to be a petitioners office and the us fraud department, but the call back number doesn't exist

The call was received from a private, unknown number, which had also contacted my estranged mother shortly before, claiming to be from a petitioners' office and later the US fraud department, although the call-back number does not appear to be associated with any legitimate entity

This number, which appeared as private and unknown, contacted my estranged mom before reaching me, claiming to be from a petitioners office and the US fraud department, but the call back number is not found on Google.

A call from a private unknown number claimed to be from a petitioners office and the US fraud department, with the caller having my information.

A voice mail was left, stating that the caller would take their business elsewhere.

The number 833-545-0615 contacted my sister and brother-in-law but claimed not to have my number. When I called back, the number redirected to another country, prompting me to hang up. This experience has all the hallmarks of a scam.

My sister and brother-in-law received calls from 833-545-0615, yet I didn't, which raised suspicions; upon calling back, the number redirected to another country, and the call was ended; this is indicative of a scam.

After calling back, the number redirected to another country, confirming my suspicion of a scam.

A call was received from this number, which was routed to another country when returned, indicating a potential scam.

The number 833-545-0615 called my relatives but not me, and when I called back, it connected to another country before I hung up, indicating a scam.