Bidvest Mandate and AZA Finance

I have received my current mandate from Bidvest Bank, being managed by AZA Finance and it has stated that there is an error, regardless that none of my information has changed. I have completed said mandate with ease for the past 4 years. They now claim that my name is incorrect, and that I should have Payoneer change it to my full name, even though it is correct on Payoneer and the exact details on my bank account? I can not change it anywhere. I have tried to contact AZA Finance and they were not helpful in any manner, insisting that I change my name with Payoneer. I have contacted Bidvest and even though they have escalated the matter, nothing has been resolved. Why did Bidvest change the mandates to another company and why are there so many problems with AZA Finance not answering calls.