Water spots on inside plasterboard near bifold and windows

[ash2072]

Hi all I was wondering if someone can help me pls. I’m at my wits end.
Two years into extension. And both the side elevation windows and bifold door are allowing water to track in. Not huge amounts but wind driven rain is causing water spots internally around the bi fold door and windows particularly on the south facing wall
Where bifold kitchen window and bedrooms are.
The extension is the left but builder changed a few bricks to allow
For change in new windows
Etc.window fitter fitted the windows and doors not the builder
I have asked builder if he put in a cavity tray and he says yes?!!
Spent a fortune (builder wasn’t cheap) and I am being fobbed off I feel.
I had cavity closers in around windows and door before the window company installed.
More recently I’ve also had water above skirting board in open plan where kitchen is and some along where the plasterboard meets the door frame.
I am certain there are no cavity closers there. But certain everywhere else they are .
As I have photos on phone. Pls can someone provide an insight into why this is happening
Thanks

 

[noseall]

One look at that brickwork setting out....

eek!

 

[ash2072]

I don’t understand

 

[ash2072]

Honestly the builder was not cheap brickwork aside please can you offer me any advice regarding these water spots appearing inside.
Mortar looks ok outside as I had it pointed so the old meets new wall