Misleading False Adverti*****t, Flawed User Experience, Terrible Customer Service, Zero Consistency

So i went onto the sterns TFG website to purchase an engagement ring and my girlfriend and I found the ring she wants for R6999, and it has an option on the site that says "if your account is up to date you would pay no interest over the 6 month payment option", we then continued to place an order on the site and it picked up that i had over paid my TFG account with R250 and gave me the order price of R6749.so I decided let me do the purchase, only to find out that Stern's website, doesn't allow you to buy on account, online, the emailed order number also doesnt give you a TFG payment option, I then app**** for a sterns account via the TFG website thinking I'd then have the option to do so, filled in the forms and got approved provisionally, but still no option to purchase online ..I then called a store near me to see if I could come instore to do the purchase with my TFG account the lady advised me I could ...I tried to confirm the price ...only to be told NO SORRY THE PRICE IS NOT THE SAME AS ADVERTISED. I then called TFG Cape Town and was told to email *** and *** both TFG affiliated, i sent a couple emails to them as they don't have a call center, they haven't responded to me as yet.I then spoke to someone on their Facebook page who then advise me that they unfortunately cannot assist me to do an online payment because there's no option to do that online and the advertiserd price online does not the apply in store.So to me this doesn't make sense why advertise a price online give you the option to buy it on your TFG account online with the ADVERTISED price and then not have the option to buy it online, you can go instore to buy it but the FALSELY ADVERTISED PRICE doesn't apply instore.I am not happy with the BAD SERVICE and FALSE MISLEADING ADVERTI*****T, the price online and instore shouldn't be different, and there shouldn't be an issue with payment options on the website. The user experience is terribly flawed.