How to download digital copy of my game? (Switched computers)

So, I lost my Sims 3 seasons disc a few months ago. It was already downloaded on my other computer, but then when my brother was using it, he spilled juice all over it and now it isn't useable. We had all my progress saved on a flash drive but no one knows where that is. When I got a new computer, I just started over. So, this morning, I decided that I would just buy the game through origin. I purchased the game but when I clicked the download now button, all it did was send me to a quick loading scree and then take me to the my games section. I tried again but the same thing happened . So now I have paid for the game twice but it wont download. So after that whole ordeal, I decided to look it up an I found something saying that the game could be registered through the Sims website so I did that and it worked. But when I went to go register my digital copy" though origin, it said that the code was already used. So origin isn't working for me right now and I don't want to pay for the game a third time just for it to not work again. Oh and, the games that I have downloaded don't show up under my games section. What shows up is the base game for Sims 3, Sims 4, and the demo for the Sims 4 CAS. I have downloaded multiple games through origin and they worked fine. Can someone please help me with this problem or show me how to contact origin? Thank you!