Most important thing is to remember that you have the right to cancel your CPA at any time. If you desire to cancel your CPA contact directly your loan provider and card issuer and notify them.
It is a good practice if you write an email or letter to both your lender and bank to stop payments immediately. If anything goes wrong you will have a written evidence of your cancellation request and you can reclaim your money if the lender has been taking it from your account without your permission.
Always check your bank statements to ensure your CPA`s has been cancelled.