Why is my galaxy tab using mobile data not wifi

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?

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