Poor service

I have registered a ***** case with Nedbank where after some time they refunded me. The same storey is still happening and Nedbank do not respond to any mails to the same ***** department and person. I then laid a complaint to the complaint department and only received a automated client feedback, still nothing happened. I then try to contact the complaints department as advertised on internet and it seems the line does not work. Being with Nedbank for more than 15 years and do not accept this this poor service.