Very disappointed

A bout a week or two ago I went to an Old Mutual in Motherwell Shopping Centre, Port Elizabeth to make a refund claim. I was assisted and I was specific that I wanted my refund to be put into the Old Mutual Bank account. They even gave me a copy of my Old Mutual account details, and was happy and went my way. Now to find out the refund my put into my old FNB account instead of my Old Mutual account. I am very disappointed by all this. more specially said sad.