Cancelled optional warranty to the dealership, can this deducted to my monthly payment?

Hi, I cancelled my optional warranty to the dealership and I see that it’s been applied to my principal in TD auto finance. Will this mean that my next payment due will be moved since I have fulfilled some payments? Also, I am on auto payment and my payment was on the date that the refund has been posted, can I request for a refund on my monthly pay? since in my understanding, these will be a double payment.