If the goal is to play Sims 3, then yes, you should return this laptop. It's not really capable of running much more than the base game and maybe an early expansion or two. (Stuff packs would be fine.) With a 128 GB hard drive, you won't have much space for anything aside from the game itself and Windows, and the 4 GB RAM is going to be a serious limitation as well, with Windows possibly taking half of that and the graphics chip needing to borrow much of the rest. The graphics chip itself isn't great either, although it's not terrible for that price range.
If you'd like help picking out something that might work better, please let me know your preferred budget as well as any other considerations that matter to you. Or, if you can go to $600, this one should be able to run all your packs on mostly ultra graphics settings without any issues:
https://www.walmart.com/ip/915598119
The hard drive is still small, but it's manageable. If you want more storage, this one is $650:
https://www.walmart.com/ip/574675577
If you'd rather not spend that much, your options are more limited. The way Sims 3 is programmed, thin and light laptops don't handle its most demanding features all that well even under the best circumstances. So you could get something that would probably struggle with Pets and Seasons, although outcomes do vary to some degree; or you could get a used gaming laptop on Ebay or the like.
