I just got a call from this number but because the number (prefix)  looked strange I rejected it. Glad I did

got a call, put it into missed call, doesn't know who

I also got a call from this number from a man who was quite rude.

calls but leaves no message and I don't  know caller

Also had a missed call. Don't bother trying to ring them again folks.Yet another one of those crappy SCAM places that rings you, doesn't leave a message and of course, when you try ringing back, you get an engaged signal.Simply,  just forget about them. If they ring again, hang up.