A downpour of rain has caused one of the ceilings in my bedroom to leak. Now a small little hole in the ceiling is dripping water. 

I would like to get to the bottom of how I can prevent this from happening. 
The first thing I did was call roofers to determine if there was a hole in my roof somewhere where water was coming down. The first roofer couldn't find any holes so I scheduled 4 more inspections with different companies. They all told me the same thing, "your roof is still new and we were unable to find any holes or causes to the leak."

So then I decided to add some water proof coating on my house, so I purchased a couple thousand dollars worth of silicone coating and coated my roof with it. Unfortunately, when it rains, the leak is still happening. 

At this point, I'm beyond frustrated with what is happening. I'm a new homeowner so sadly I'm not too savvy on who to call for stuff like this or best and efficient things to buy to identify the leak. (I thought the roofers would help trace it but they didn't…they couldn't determine it was a roof problem and left). So who do I call then? 

One option I had in mind was to tear the ceiling apart and identify the leak from that point of view but I'd like to see if there are any other inexpensive options I have not considered yet. 

I also thought it might have been a leaky pipe but the leak only happens when it rains. But a weird thing is that it doesn't **always** happens when it rains. Which is baffling and hard for me to fathom. I also turned on the upstairs shower and let it run for a bit and no leak happened so it's probably not a leaky pipe. 

Any help for things I can try or materials or tools I can purchase to find out exactly where the water is coming from is appreciated!