This is an old scam. We had a charge of under $5 on our bill a few years ago. I checked the business name on the internet and turned up an article about how some Russian syndicate was billing lots of Mastercard accounts for small amounts. We called Mastercard and they removed the amount from our account, but the person we talked to didn’t seem interested in who was behind it.
>>small amounts.
Yes, small amounts, often a dollar or less is a big red flag.
If you can:
Set your alerts at your bank/cc to notify you w/email of every debit/charge.
A small charge is a test; big one coming next.
That person might well be the one getting a small commission on credit card numbers he provides to the scammers.