The $50 charge is likely because you opted in to use Data Credits.
When you opt in to use Data Credits, your account is automatically topped off with $50 (500 Data Credits) whenever your data credit balance drops below 50 credits.
BounceShield (1 Credit)
Enrich AI (1 Credit)
Phone Finder (5 Credits)
Go to your Subscription Settings
Bottom Right of Page > Click "Data Credit Settings"
Toggle Settings On / Off