Peugeot 308 warter ingress

Checked the water drains underneath door are clear ?

I have the same problem with my 308, the drain holes are rubbish & positioned wrong, open whatever door, underneath the door you will feel the rubber, pull the rubber to one side, you will see the water drain out, the solution in my opinion is to make the holes larger but that solution if not done right will cause rust, so just think about the result before carrying out the work.