Disappointed And Frustrated

I went into FNB phoenix plaza branch about 6 months ago.The reason for my visit was that my fixed investment was maturing & they had kept paying the interest into my cheque acc which i didn't want.I had asked a lady to please make so that the money does not come into my acc & instead accumulates in the investment. I even explained to her that i had being in the year before to do this & i was told then it was sorted but one year later & the same thing has occurred again.It seemed like she wasn't sure what she was doing so she called the manager to help.They had assured me that everything was sorted out & that the next time the investment matures the interest will remain with the fixed investment.It is now 6 months later, the investment matured & the interest was paid into my cheque acc AGAIN!!!!! I'm so tired of keep going in & trying to get them to do this properly & at the end of the day it is still not sorted out.The frustrating part is that i will only know after a year or 6 months, when the investment as matured,if they did the correct thing & by then the money would already be paid into my acc.I have banked with fnb all my life so this is very disappointing & frustrating.