If you are getting billed regularly on your credit or debit card by the same company then there is a huge possibility that you may have signed up for a subscription.
Second possibility is that you may have or your family member or girlfriend or boyfriend may have signed up for a subscription.
The Third possibility is that your card details may be stolen and fraudsters may be billing you at fixed time to keep your confused so that you keep paying for long term.
So what is the solution.
Simple . Check your statement and see the descriptor. It may reveal what payment is that for. If that does not work as your card issuer for details. If none of the above works then you may have to replace the card.
If you are sure that transactions are fraud then you may also initiate a chargeback.