Unable to make purchase error 6004

[mrswake89]

I am currently unable to make any puchases, I keep getting an error message 6004. The items are not showing up in my history and when I checked my Paypal account it says that both orders were Refunded. I have tried calling ebay but I keep getting a busy signal. I have enough money in my account for the purchases. I'm very frustrated and confused by this... It's never happened to me before. Could someone please give me some adivde to ease my mind?

Thanks!