I'm guessing that this is a young person who can't get a credit/debit card. OP, you could always buy a prepaid debit card with cash. They sell them at pretty much every grocery or convenience store.
A valid payment method, or paid game time card, for subscription is required to play Elder Scrolls Online. There is more information on setting up your account, and the charge this may involve, here.
If you have a support issue, please bring it up in the support forum. There are already several extant threads discussing this matter, you are welcome to jump into one of them. But, since this specific forum is for game guides, not support, we are locking this thread.