iPhone X Excessive Data Usage

I got the iPhone X exactly a week ago. Ever since, I have completely regretted it. All-in-all, the phone is amazing, and I love it... but I have never run into to many issues as I have in the past week with this phone, than I have over the past 5 years that I have owned iPhones.

The phone I had before the X was the 7... I use data once and awhile, but I never go over my data plan which is 4GB per month. The morning after I get the iPhone X, I curiously check my data usage through my cell provider, and I had used almost 1GB. Rogers had stated that I had used almost 1GB of data at 10:34am last Friday (I didn't even have my phone on me as I was in a meeting, and it was connected to WIFI). Ever since, the data usage has been insane on this phone, to the point where I have contacted Apple and they have told me to turn my data usage off so I do not go over my usage. Almost all of my apps have their data usage turned off, I have always had WIFI assist and iCloud drive turned off, as well as background app refresh. It doesn't seem to matter if I am connected to WIFI, the phone seems to still love to eat up the data. Apple has given me no answers, other than the fact that the iPhone X has enhancements that might use cellular data regardless of a wifi connection. But for these enhancements to use so much that I have to actually turn off my data is ridiculous... They haven't been able to give me a more reasonable answer. This phone has become virtually useless to me, the second I turn my cellular back on the feast of data begins. Has anyone else experienced this issue or have any answers? It's sad that this is what it's come to... Apple can't even give me an answer to an issue with their product.