Default Note 3 Wifi not starting after a Custom ROM

Hi All,

I recently purchased Galaxy Note 3 from Saudi Arabia nd i was using the saudi sim there and it was working fine.When i came to india i found that my indian sim are not working and its asking sim network unlock pin.So i contact samsung for the same and they told me to send my mobile back to saudi. So i gave my mobile to one of the local Mobile Dealer and he screwed everything..i dont know what he did...But now i am unable to use my wifi and none of the previous sim is working.What am i suppose to do now.Please suggest me...I have hardly used my note 3 for 2 days and now i am unable to use from 1 months,