Won't allow me to add new credit card

[Perplexed44]

Keep getting error message to try again later when I try to add a third credit card to my account.  Have tried several times over two days.  Tried to call for help and have been on hold for over an hour!!!!!

[TB9]

Been trying for 5 days, made 8 calls to support. Last time they told me there was nothing they could do. 

They have the nerve to call them selves customer support.