FNB HOME LOANS **** about qualifying for 50% back on your first repayment if you apply online

I am referring specifically to my disappointment in the home loans department. I app**** for a home loan online because it was advertised on https://www.fnbpropertyleader.co.za/ that I would qualify for 50% of my first payment back in e-bucks. The time has come where that first installment was paid, however when I called the e-bucks call center to ask about why the e-bucks did not come through, they claim that it was false advertising and not true. I recall that this was a benefit and the lady at the call center said I should tell her where on the website it says I qualify. When I tried to visit said website where I app****, it says the page no longer exists, as now one needs to apply directly through the FNB website and no where is the e-bucks benefit stated. How is it my fault that the website has changed? I also have email chats with the consultant who confirmed I would qualify for the reward, as proof that this was an actual benefit. Now all I can do is complain, why lie about these things to get people all excited for nothing? I have proof in email form.