I called back the number (07) 3518 6835 but the call didn't go through

They have rung me everyday since the 3rd of December. I don’t know who they are but definitely not a number related to me or my family.

When the call came through my phone my phone identified the number as a scam or fraud..

Interesting to see that the only other activity on this # is someone else who was also called today. They called me international, btw; I'm currently overseas. Strange.