Net Stopped working Suddenly..!!

Hello,

Yesterday night Suddenly my net stopped working while doing wats app in my Windows phone 520, please help me out to solve this problem.

I switched off my mobile then after sometime again switched on, off the mobile data then again make it on but all the efforts was useless. Net Icon is still there seems to be active but not getting emails,wats aap message even not able to open website.

Thank you !!