How do I handle this situation with my landlord and a leaky air conditioner?

For a few weeks I’ve been having issues with my air conditioner leaking when it rains. It’s not the actual AC that’s leaking. It just allows rain to come in. More than a few times I have woken up to a soaked bed, pillow, and floor. I have to pull my bed away from the wall and put towels on the floor. The wall is bubbling up because of the water. There is an electrical outlet that the water runs right over (which I assume is dangerous). I have told the maintenance guy 3 times. I came home tonight to find a soaked mattress again (brand new by the way). I called the apartment’s after hours number. The maintenance guy returned the call, which I accidentally missed, but he left a voicemail stating that he did already stop by sometime last week and sealed it. I have no idea when he was even here. I checked around the unit, and couldn’t find what on earth he “sealed”. Clearly it didn’t work anyway. He also said turn off the breaker to the electrical outlet, which I did, and that he’d be by tomorrow. I’m now sitting in my very warm apartment, unable to turn on my AC, and unable to lay in my wet bed. I’m not very happy. I’ve been asking them for weeks to fix this. Now I’m mad. My brand new mattress has water stains all over it now. I can’t use my AC in this muggy weather. And I have to sleep on the couch. Come on! Is there anything I can do about this? I don’t believe for one minute that this guy actually came into my house and sealed it. Why wouldn’t he tell me? Why would he just let himself in while nobody was home? And why wouldn’t I see the seal? Any advice?