New Architraves Fitted - Gap

ShaunOB992

I have just had some architraves fitted in our house and there is a gap between the architrave and the door frame.
I think the reason is because we had the house plastered before taking the old architraves off, a rookie error I know.
The quality of the work isn't the best I know however it's something I need to sort out and make it look better.
Would it be acceptable to caulk this gap?
Any ideas will be appreciated on how to make this look better. 

Thanks

travis-powers

That’s awful workmanship, it looks like his has used gripfill and pins so taking them off isn’t an option I would caulk it let that dry and shrink then caulk again flatten it off with a wet filling knife or old chisel.
You could use filler but the gap looks quite big.

EssexExile

Could you cover the gap with some quadrant moulding?