[Payday loan provider address]
Loan account number: [add details]
I write in connection with the above loan which I entered in to on [date], and to request that you cancel the continuous payment authority (CPA) that was set up to make payments under the loan.
I have notified [bank] of the CPA cancellation and accordingly no further payments should be applied for under the CPA.
I would request your written confirmation that you have actioned this request and that the CPA has been cancelled.
I look forward to hearing from you.