Binance won’t let me buy!

Obviously there are lovely sale prices going on, I want to take advantage and buy. Earlier when I tried, binance told me I needed to complete verification. Which was all done when I joined binance last year. Now it’s no longer putting verification as a barrier but when I go to buy it’s asking me for my bank details, which should already be registered. I go to input my bank details again and it tells me that those card details are already registered to my own email address and to “deregister” that address before trying to add the card. Anyone else having similar issues? Planning to leave binance cos this is lame af