Decline credit card transactions

I received my credit card on 11/01 and activated it as per instructions, got a confirmation text saying that I can transact only to find all transaction being declined by ATM and pay points, called CS and being told the credit is showing on the system to use and to check later again, went again later to transact, only to find the same issue, how embarrassing, called them again and then being told there is a system issue, IT working to get this resolved, got a call the next day to inform me that all were resolved and I should be good to use the card, still being declined and then got told they do not know when this will be sorted out, I received my 1st invoice/statement and payment due on 01/02/2024 and still can't even use my card, got a text also to say not to missed payment as it will affect my score, what is going on as it looks like the people in IT do not know what they are doing, having meetings after meetings and still now timescale as to when this will be done, how difficult is it to make the credit available which shows on the statement and system, not a good start as a new customer, very disappointed, please get this resolved.