Tele sales upgrade credit card with false info

I had a GOLD Discovery card with no hassles until 2 weeks ago received a call from a telesales rep stating i qualify for limit increase. I declined the full amount offered and settled for a lower increase. <br> Also offered upgrade my GOLD card to Platinum. I enquired about the benefits, cost implications which she informed me. She specifically mentioned that the Platinum card carried 18.85% interest rate. I asked her what is my current interest rate which she clearly mentioned was at 22.65% and i would save 3%. Based on this information i signed the quote sent to me.<br> <br> The PROBLEM comes in when i checked my statement as i wanted to confirm interest rates, i was actually on a 15% GOLD card interest rate linked to my profile which clearly states on the website. And now my so called new platinum card rate is 18.85%.<br> <br> In effect i am paying a higher monthly card fee and higher interest rate which i did NOT call Discovery to upgrade. Based on false information provided to me they will not downgrade my card back to what it was.<br> <br> The telephone conversation is recorded yet Discovery refuse to assist. If all fails i will take this up with the Ombudsman, failing which will be time to close the ac