I would like to update my subscription payment method with the new card and set it to be charged automatically

I want to update my payment method, but I can’t. Every time I authorize it on the website, it gets denied or say somethinbg wrong came. I check the expiry date of the card, numer of the card, everything, and everything seems to be in order. On my account, there are two cards – the old one and the new one ending in 612 – but I still can’t set up a new automatic subscription. Coult i get an asnwer on my email llg_dark52@yahoo.com