Hello Aliyah, 

The cause that was provided is one of the possibilities why you're charged for mileage tracking. You could have accidentally subscribed to the QuickBooks Self-Employed plan. What we can do is to verify.

Let's log in to the QBSE page. Please use the same login credentials you use when logging in to QuickBooks Online. Click here. 

If you were able to sign in, you can cancel the subscription. If not, I suggest reaching out to our Customer Support Team to walk your though how to manage your active accounts. You can schedule for a callback and we'll be the one to contact you.

Here's how: 

1. In QuickBooks, click Help ( ? ). 
2. Then, select Contact us, and enter a brief description of your concern. 
3. Click Let's talk.
4. Then, select Get a callback. Follow the onscreen instructions on how to set a callback. 

Keep me posted for any updates by leaving a reply.