I have watched youtube short in which tech guy telling that if your mobile has call forwarding (*#67#) enable than you can simple disable (#002#) i found this +923001980013 on my BUSY call frowarding,, than i simply disable and above all i called mobilink help line for further asking about this,, they told me that this # not belongs to any one and its just a template,. I request them to remove it permenantly,,, they told me nothing to worried... Thanks guys