Jerry is encouraged by his newspaper to sign up for automatic deduction from his checking account. But in the past When he tried to cancel the subscription it took him months to stop the paper from deducting the funds from his checking account. What do you advise?

Pay electronically by adding the newspaper to the list of bills that Jerry pays from his bank account. Thus, Jerry pays them electronically from his account; they don't take money from his account.

They deduct the amount right out of his checking account. Because he gave them his routing bank number to his checking account

I only do that, with firms and companies I can trust. And then only by using a debit card.
Then you can always cancel the debit card and get new one issued.

They deduct the amount right out of his checking account. Because he gave them his routing bank number to his checking account
Cancel that.