Card locked and can’t pay

I tried to pay my Bilt 2.0 card balance early last week and for some reason, Cardless keeps sending me an email that the payment didn’t go through. I’m using the same bank account that I used to pay my mortgage through Bilt without any problems - rent/mortgage works fine but not to pay my card. I’ve tried three times and there is nothing visible on my bank’s side at all.

Cardless support said they can’t see why it failed but it must be because I don’t have enough funds in the account, which isn’t true.

Additionally, as soon as the first payment failed, my card completely stopped working. There is no evidence of this in the Bilt app or anything, but it seems like as soon as any payment fails it just hard locks your card. No reply from Cardless for a while now.