FNB **********ly amending loan dates

I took out a personal loan from FNB on September 26th 2014 which I then started to make payments on. I recently received a credit report through a Better Bond home application and was shocked to see that FNB had blacklisted me for the same loan and **********ly stated to the Credit Bureaus that I took out that loan in July of 2016 (to make it seem like the loan was taken out more recently that it actually was). I knew that the date they stated was completely incorrect as I remembered clearly when the loan had been taken out and also because of the fact that I was unemployed from February to August 2016 so it was impossible for me to apply for any sort of credit. As I have changed banks to Nedbank a while back, I went to Gateway FNB and got a statement of my account from 2014 and it clearly shows the loan being paid on the 26th of September 2014 with subsequent payments being made which even confused the FNB staff at Gateway FNB. That is a 2 year discrepancy and obvious ***** that I am now going to take legal action on. I would love to hear what you have to say FNB as your branch could not give me any answers. This is going to get very interesting as you have cost me my home loan. P.S. I have the FNB stamped statement from Gateway FNB as proof as well as the ITC credit report with your ********** date.