Did not purchase ZP and got charged $90?

Hello, about 10 times this month, I would randomly get 10k ZP in my account (Ghost_Kohl). I thought nothing of it, and just spun some crates. I did buy 10k at the beginning of the month, but after that i'd randomly get ZP. Today I got the billing paper saying I spent about $90 total this month on ZP via PayPal, when I never did. Help?