Home loan Debit order not going off

Debit order for home loan is not going through very disappointing, this will be the 4th month that I have to pay my home loan manually as the ***********'s of the staff of ABSA Homeloan they blame FNB and FNB is blaming them and it is going backwards and forward with issues I have signed a new debit order form to make sure it goes off once again to my knowledge it did not go off, I do not want to fall behind with my loan I do not know how many e-mails I wrote and telephonic conversation I had to resolve this issue, it is still an ongoing issue.

I want in writing from a manager to explain to me what the issue and how will they rectify this issue and problem that is going on for the 4th month in, I do not want them to to PHONE me as it does not get resolved.