poor service

In accordance with my agreement with the insurance company, the agreed debit order date is the 20th of each month. Any change to this agreed date, including a change to the 18th, would require prior formal written communication and my explicit notification. No such communication was received, nor was I informed of or consented to this change. Please note that my salary is paid on the 20th of each month, and I do not receive payment on the 18th. The premature processing of the debit order therefore resulted in insufficient funds, which directly and negatively impacted my cheque account payment profile. I regard this matter as serious, as the debit order was processed contrary to the contractual agreement and without the required notification. I request this issue be investigated urgently, the adverse account impact rectified, and confirmation provided in writing.