Very rude and unprofessional

I work in the HR department of an enterprise based in JHB - this morning I received a call from FNB wanting to change the banking details of an employee of the company. When I advised the lady that while I can confirm employment I cannot change the employees bank details without his authorisation, she put the phone down in my ear. Very unprofessional and very rude :( And how can the bank expect HR just to change banking details without the authorisation of an employee ?