Unfortunately, I don't have sufficient information from either of you to work with. Can you give me a detailed description of the purchase process you went through? How you got to the Recharge Diamonds page, package selection, payment type, and so on.
Trin, if you tried to go through the game client to get to Recharge Diamonds, well, it's unfortunately broken for the US game. It redirects to the EU website. You can get to the US site from there, but it can be hard for people to see how it's done. But, your description of the game client freezing/crashing makes it sound that this is the route you tried to take.
Palin, in your case, and depending on if it's a first-time purchase, or a first-time purchase using PayPal, it can take up to 48 hours for diamonds to appear in your game account. Or, sometimes, you have to relog for them to show up. Again, it can depend on the payment type.
Please post the information that you can, and I'll see what I can recommend. But I can't give you any direct assistance.