Long overdue debit order request.

Employer changed salary dates from the 18th of each month to the 20th of each month. All details and proof provided to bank- customer service, credit department, collection department. Service provider still deducts my spare funds for the month on the 17th per debit order, after numerous requests to to move my debit date to the 20th of each month, also receive threatening sms’s from provider of a bad credit score. Reported dispute at ombudsman for assistance, no change from September 2022.