Mobile data being used while on wifi?

May 27, 2021
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I have a Galaxy Note 10+ and I was at home today and out of no where I got an alert saying that I had just exceeded my monthly data limit and was now in data saver mode. Both devices on my plan were at home all day...

What could have caused this? I know in the past I have seen a setting that will improve your download/upload speeds by using mobile data and wifi together but I can't find that setting anywhere to check and see if it is on.
Besides that, I am clueless how this could happen and seems pretty shady on Verizon's part...