Billing on FNB - Wrong Contact Details

Good day<br> <br> I have an enquiry regaring NBA - I am in the process of settling my account. I have asked for a discount as i will be settling the amount in full. They came back to me stating that they will not give me a discount as they had already proposed a discount to me in November 2014. Unfortunatley they have my wrong contact details and were unable to get hold of me. They have claimed they have sent sms's on my wrong number last year proposing a discount with me. I have explained my dilemma with them having my wrong number - so i negotioated for them to offer me the discount again - They refused saying it was only valid in November. I am humbling requesting an opportunity on the discount as i will settle the amount i owe in full. i didnt even know that they offered a discount in November - they had the wrong number