How to re-activate debit card automated payment method linked on the account?

I have a debit card linked to the account... It's since been de-activated because i had in-sufficient funds once, but i've sinced added more funds to it therefore i want to re-activate the debit card i already have linked to the account.

But i can't seem to find anywhere on the virgin media mobile app or website how to re-activate the debit card linked to the account, or even see the automated payment methods....

I tried asking the customer support online in chat, and they couldn't help and said to call.

I called the virgin media number and its impossible to reach a human to speak about the payment / billing issues...