Pre-approved loans misleading

I was recently contacted by the African bank call centre whereby I was informed that I have been pre-approved for a consolidation/personal loan of R140000 or a credit card to the value of R70000. I then proceeded with the application for the consolidation loan with them and was informed that I had to go to my nearest African bank branch with all supporting docs to finalize the application, which I did last week Saturday. I was serviced by a very friendly/caring consultant, Ayesha Janodien who explained to me how their consolidation loan would work for me and my financial circumstances. I was then contacted on the 22/07 by Ayesha and was informed that my application was declined. Even she was stunned by it!! When I called the call center to find out the reason why, I was informed that my affordability was too big or something to that affect. What I do not understand is why did African bank contact me in the first place informing me of a pre-approval loan and proceeded to do the application via phone? Why did their system not at that stage after the phone application was done give them the \loan declined"confirmation? I feel that this is in fact misleading the consumers!!"""