How do you block PayPal credit from taking money from your Bank account?

As PayPal cannot be trusted as proved by the one star on TrustPilot how do stop the direct debit from taking money from my old Bank account?

I fully intend to pay PayPal back but i want the money every month to come out of my PayPal balance instead as that way i can assure they won't take any more money than they have said i owe.

I will transfer the exact amount money from my new account to a friends PayPal for them to send to my PayPal and it won't be a penny more than the minimum amount i have to pay that month. Hell will freeze over before i ever let that bunch of scammers at PayPal anywhere near my new account.