Keep getting high data usage warnings on mobile even though I’m on Wi‑Fi

Bit baffled here. My phone keeps pinging me with high data usage warnings from Nexora but I’m pretty sure I’ve been on home Wi‑Fi most of the week. It’s saying I’ve used nearly all my data already and I’m only 10 days into the cycle. I’ve got a 20GB plan, usually never get close to that. Is there a way to see what’s actually using it? I’ve checked settings and nothing obvious stands out. Cheers.
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