You have 4 people going after 2. Of course it'll most often be successful.
All you can do is tell your adc AND support to ward, yes both of them. A ward in the bush at golems, a ward in tribush, and a ward in the river. If the jungler is willing to help, a ward in the blue/red spawn bush at the back depending on what side you're on, I say jungler as if your bot lane is behind a bit it's better if both stay in lane. Also to ward the bush(es) in the lane, in case the jungler/mid/top decides to sit there and wait if your bot is pushed in.
If you can see them coming, you're not as surprised and can usually turn that 2v4 in your favor, more so if they dive the tower. Especially if the jungler is near by and sees it, he can run there himself and make it a 3v4 if he's able.
If you're bot lane/jungler wards but the bot lane doesn't have the map awareness to notice anyone coming well... not sure about how to help there.