MISREPRESENTATION IN LOAN OFFERS

I have been a Natwest customer for 10 years +, no debt trouble, credit rating is good. Researched for a £8000 loan over 48 months on comparison sites Natwest weren't the cheapest but as they were my bank I thought I would probably get the money quicker using them. The website stated a 4.6% rate for existing Natwest customers only, Brilliant....or so I thought...
I spent an hour going throught the application online, losing the webpage half way through and having to start again which didn't impress me, this is no fault of Natwest mind you. Anyway got most of the way through the application and reached the review page and it suddenly appeared with a completely different interest rate and monthly payments (much much higher), I went back to make sure I hadn't clicked onto the wrong offer, I started the whole application again thinking I had made a mistake but no,the review page said the same thing again.I telephoned Natwest who in turn said yes the review page was correct and and this was the offer given to me even as an existing customer...I obviously told them this is not how it is written on the webpage but the lady on the phone said this only applys to some customers...so I obviously said NO THANKS!!!! Who are these 'some customers??' They could see from my bank accounts I hardly ever go overdrawn, don't owe any money and have a regular good wage coming in and have some savings but they only offered me the higher rate...
I wonder if it is a dangling carrot situation where you think oh well I've done the application now I might aswell carry on with it and pay a higher rate. Mmmmmm If this is the case then I think this is a very untrustworthy hand to play.