FNB Credit Card Stopped

I had a Gold Cheque and credit card accounts till they upgraded me to Premier accounts mid June, cards were issued and delivered to me at my work place. I cancelled the cards on the app as soon as I received new cards. I called at FNB to reduce my credit card limit as I also needed assistance on activating my credit card. Balances were then transferred from Gold to Premier on the 19/06 according to the statements but funny enough on the app the Gold credit card appeared till such time the Gold credit card accumulated a debit balance of R92 as it was still active in their system. I called them immediately after receiving sms’s of the exceeded balance and a lady I spoke to confirmed the account will no longer appear in the app as the account is closed. Little did I know they transferred the debit balance to my new Premier account which then now caused it to be “over lined”. I can’t access the credit I had as it is a revolving account and on their system now suddenly the amount has increased and that I owe a new debit balance, they’ve changed my limit and no one seems to give me concrete answers. The matter has been revolving different consultants who always escalate the matter to their team leaders but none of those team leader or management give me concrete feedback or have sorted the matter. I always have to call them everyday and I get stories. After 8 years with them if and when the matter will be sorted I’m definitely switching banks cause none of them seem to know what they did wrong to my account.