The deprecation notice means that the functionality still exists, and the credit card field will still work. However, it is going to be removed, which is why we put up the notice to switch to the Stripe card field or Stripe Checkout. There is no date for when that functionality will be removed, which is another reason we warn you to update the form now, before it breaks due to the removal of the functionality.
This problem does come up occasionally, but each situation and circumstance is different, which is why I asked you to open a support ticket. With that, we can gather all the information we need to assist you (something we could not do in these forums.) Additionally, with payment issues, because they are so important, I always recommend opening a ticket, rather than relying on public advice in a forum.