I checked the missed call list and found two different numbers
+216 74 871 879
+216 75 796 973
216 is the area code for Tunisia, and I don't know anybody in that country, so I looked the numbers up on the web.
Several people have reported getting one ring calls from Tunisia.
Don't call back. It will divert you to a premium rate number which will cost you a fortune.
I've blocked the numbers and all other numbers beginning in +216