Garage foundation Leak

Hello,

I have a 2 year old home. There is a water penetration during heavy rain in the garage. Some water drips from the ceiling causing puffy area on the OSB sheathing and some water seems to come out from the sill plate( I think its normally permeable to water). The water from the ceiling might be coming from the roof that is over the porch which is connected to the base of the ceiling (it below the main roof of the house). I am having hard time with the builder, as no one sees anything serious about it, and no one is willing to find the root of the problem. Since I mentioned the roof, they will only send some roofers to inspect the issue.

My concern is having mold and deterioration of the sheathing.

Is it common for water to trough the sill plate?

Is it worth calling Tarion as they might keep the deposit if the item is not warrantable?

What kind of professional can I contact to assess the damage and the cause?

I added a few images:

1. Showing a month difference between the water penetration from the sill plate (not sure if the black cloudy are is mold now)

2. The corner of the foundation (inside and outside)

3.Ceiling from where the water comes down.

If you have any suggestions about the matter, it would be greatly appreciated. I am not getting much action from the builder.

Thanks for reading