Debit orders

I’m ****ed as I specifically mentioned that my debit order should be go through on the 20th irregardless if it’s on a weekend or holiday, you guys attempted to debit on the 17th which I never gave you permission for that date. You’re only permitted to debit on the 20th, now a bank has charged me for unpaid debit order because of you, please ensure I’m reimbursed what I’m charged by the bank as I cannot tolerate this nonsense, let alone that it’s negatively affecting my credit score. There are so many service providers out there and I can easily jump the ship.