Disinformation to approve home loan

Late 2013 I app**** for and received a home loan with nedbank. I complained about the high interest rate and was informed by the consultant that I could negotiate the interest rate after 12 months of paying my installment. A few days ago I emailed the consultant requesting details w.r.t. negotiating the interest rate. At first my email was ignored. After another email I received the following reply from Natasha Ramsumer: ( Kindly note that rate negotiations are not part of Nedbank's standard business practice. We can assure you that at point of application, our rate calculation methodology ensured that you were offered the best possible home loan rate linked to prime over your home loan term. Once the Bond Contract is signed by both parties the rate becomes binding & cannot be increased or decreased during the home loan term.) <br> This means that Doreen Chetty had deliberately **** to me and I want to know what nedbank intends doing about this?.