*********** account support

I tried to use Uber the other day and when I tried to log in, it said I was banned. I realized that the previous time I used it, i had forgotten to up date my payment details as I have a new credit card. I emailed the Uber support explaining. They said they unblocked my account, but when i tried to log in, it still says banned. I emailed again. Again I got an email saying that the account has been unblocked but it hadn't. Each time I must wait a day or so for a reply. I emailed again, they emailed back saying they unbanned it and tried to put through payment (on my old credit card). I emailed back AGAIN telling them, quite irately that i have not been able to access my account to change my credit card details yet so how can they try get payment if I told them the card on their records has been cancelled and i cant get into my account to change it. A day later and I am still waiting for another reply. I am at the end of my tether. I am still waiting for someone to help me.