lured in to accepting

FNB sent me an sms stating if I use my Platinum credit my ebuck reward will increase, began using my credit card to purchase fuel, first month went no ebuck rewards, called FNB explained my problem, then the issue was that I had a FNB gold cheque card, the both cards had to be on the same level, then I left it. A month went by i recieved a message via the FNB APP, stating that i qualify for an upgrade to my cheque account from GOLD to PLATINUM, so i accepted. Then both my cards we aligned, I used my credit the ffg month, same story, I went in to the branch to follow up, now the story has changed, now I have to deposit 16500 in to my account before i can get ebucks, why did they tell me i qualify for a Platinum card when i dont. I requested to downgrade both my accounts, now i have to close an account and reopen. FNB is *******, no sense in there methods