Why is my galaxy tab using mobile data not wifi

[AC Question]

I had a red 'wifi being hacked' notification on my tablet a month ago. I turned off wifi & deleted notification in case it was a scam. Next time I tried to connect to wifi, pop-up said I was connected but wifi icon was missing on status bar. I have since discovered that I have been using mobile data for the last month & I can no longer connect to wifi. Any thoughts?

 

[L0n3N1nja]

Is the problem only on one Wi-Fi network or have you tried it on others? May be a simple fix of restarting the Wi-Fi network, deleting the network from your tablet, than reconnecting it.