Bad customer service

I am so disgusted with the serving my Mother received from Nedbank Protea Glen mall this morning. She has an investment account which has matured with interest and she requested a portion on the amount and the increased. The 'rude' consultant that assisted her only gave her the money she requested and not the interest.When she enquired of the interest all she could say was that its invested and she cannot get it. How is it my mother's problem that she cannot get her money if the consultant did not listen??? This just go to show how \Nedbank"values their customers! If I was in Sandton I can assure you they would have done something! I would like someone who can resolve this issue as I will not/never let this SLIDE!!! """