Pathetic Service from Nedbank

I have moved my banking details from Nedbank to FNB end of March, reason why i changed banks was because FNB offered a better interest rate for my home loan. Nedbank was instructed to debit my personal loan from the new FNB account. The debit order in March did not go through, I had to contact FNB again and gave them my new FNB account. The first debit order went through on the 06th of April. In April the debit order went through successfully on the 30th of April. I received a notification on 1st of April that my loan account was overdue. Again I had to furnish Nedbank my FNB account, to my surprise Nedbank advised me that they do not have my FNB new banking details. I have logged a complaint/s REF: ********** & ********** 4 on the 1st of June & to date my FNB account is not debited. (why do i have a bank statement that have successful debit orders from FNB?)I got a call from the Complaints Service Manager by the name of Kumari Marein & to date no one has given me feedback, also I followed up by emailing their complaints department and to no avail no one has responded. For the past three months, my credit score has been affected and I am so appalled that I am begging Nedbank to take their money!!