Trying to pay my bill, either get an error or endless loading

Usually when I log in the page goes to my account where i then pay the bill, but I always get this error:

This happens on every browser including mobile browsers after login. I have been trying for over a week now to login and pay. When I put in the direct URL to the payment section I get endless loading:

This also happens on every browser including mobile. I cannot pay my bill and it will probably get cut off soon. This is for T-Mobile internet if that matters at all.