unprofessional

I've change my banking details and I called in April to tell them I changed my banking details I wasn't informed they Don't over the fone banking details exchanges I have to go to branch the lady that insisted me took my new banking details over the fone so they can deduct my loan instalment every week, but the deductions never happens, I called absa again to ask again what was going on why does the debit orders not going off every month and the lady told me i have to go to a absa branch with my banking details, so i told her i will do it cos on the friday cos work is very hectic only have time on a friday, then i got a call from again from another unprofessional lady with a bad attitude, the more i tell her i change my banking in april the more she jumped done my troat about i only called yesterday, i told her to check on the system when did i change my details told me shes checking on her system she doesnt see that i change my details, she kept on interrupting me when i want to told me the lady that i spoke to the day beforw confirmed that i change my details in april, she kept on telling me that i only called them the day before i got so ****ed off that i dropped the fone