INCORRECT ADVICE GIVEN AND NOW ACCOUNT IN ARREARS

Hi there. Last month, I was unfortunately unable to pay my MFC installment. So I contacted the call centre, explaining my situation and that I had just gotten a new job etc. The call centre agent asked me when my new pay day is. I stated it was the 25th of the month, as opposed to the last day of the month, which it had been before. He told me I dont need to make a payment arrangement on my account at all because I can just change my debit order date from the 3rd to the 25th and my debit order will come off as normal and this wont affect my payment history. I am now receiving text after text after text telling my my account is in arrears??? If this consultant gave wrong info, why did QA not pick it up and rectify it with me before my payment history got destroyed?? I get texts to call the collections centre urgently, but \we are experiencing high call volumes"and my call NEVER gets answered and I cant leave a message because \""mailbox is full\""??? COME ON MFC!!!!"""