Why am I being overcharged on Shopify for subscriptions?

[Tcgkingdomusa]

I've been on Shopify for a while now and out of nowhere I get chaged almost $500. Saying that's its for subscribtions but I used only free apps and only paid for the monthly subscription to shopify. But I shouldn't get hit for a $500 bill with no evidence behind it on why im getting charged that! Can someone explain why is this happening?