As Ronnie says really, generally frames with a cill have an exit hole for the water under the frame as in this pic, this is called concealed drainage as it's well.......concealed
The hole is drilled from underneath while the door is flat on a bench in the factory, it's impossible now that the door is fitted, sometimes the factory forget to drill these holes, they do the top one but forget to drill upwards, you then have to rely on an eagle eyed fitter who spots the missing holes and can quickly drill a few.
The only option you have now other than take the door out and drill them in is what's called 'face drained', it entails drilling a hole in the front of the frame as I' this pic........
This type of drainage is used when the frame sits directly on a concrete step or similar without a a PVC cill.
You need to ascertain whether they have drilled the concealed holes or not because otherwise it means your hollow frame is filling up with water as it has no means of escape, the fitters really need to come back to sort this