As I said, I've already tried this, with no luck.

But if I try to take things out of my downloads folder and go back into the house, then some of the custom stuff will not show up.

Alright, so I spent 3 hours building my house, moved the sims in. Started playing around with a few of the things in it, and accidentally started my own home business. So I went onto the phone and clicked shut down business. I went and did something else then went back to the sim and she was out at the driveway, still with the action of shutting down the business, so I cancelled it (as I've never shut down a home business before, I didn't know what was happening). Now whenever I tell a sim to use the phone they simply pick it up and place it back down, no matter what option I select. i went into a different house in the neightbourhood and they were able to use a phone fine. If there any way I can fix this? It's really annoying because I haven't called a nanny or maid yet and I can't throw parties or anything at all. I have all EPs and SPs.
I've tried deleting all phones, exiting, deleting my cache and then going back and putting a phone in again however it still hasn't fixed it. I really don't want to have to go through and delete the house though, is there any way I can fix this?