cannot check out

for four days I have been trying to place an order on walmart.com and it will not allow me too, Just says due to technical difficulties we cannot show the page you are trying to view. and when I was able to make it through checkout when I got to place order and pushed it, it came back with an some crazy error about entity to large or something like that. Called twice and they cannot place it either. THey just say try in a couple of hours, getting tired of trying really.