Please help stop this people from harassing me.

I have been receiving disturbing messages from Atlas finances alleging that I owe them some money even though they don't indicate how much. I contacted their debt collectors number but what surprised me is that my contact number is registered in someone else's number on their system. I requested them to remove my number from their system but it doesn't look like they did, as I'm still receiving their messages threatening to take legal actions against me. The number is *** and they are alleging that it shows someone else on their system. Please help 🙏.