What I was told by Ufone is that, this number's series belongs to Pakistan's city "Mitthi". After that It is against the privacy policy of GSM networks to reveal more information about that user.
But here is an option, If you are using Ufone, You can activate call blocking service and get this number blocked by dialing 420 and following instructions.
Don't worry If you are not using Ufone, You can still send complain about this number to Ufone, If you received more than one call/SMS from this number.
Ufone's number is 111333100 from all networks and only 333 If dialed from Ufone.
My best wishes for you.
But here is an option, If you are using Ufone, You can activate call blocking service and get this number blocked by dialing 420 and following instructions.
Don't worry If you are not using Ufone, You can still send complain about this number to Ufone, If you received more than one call/SMS from this number.
Ufone's number is 111333100 from all networks and only 333 If dialed from Ufone.
My best wishes for you.