Originally Posted by DJSapp
Tell the contractor they fucked the pooch on this and you want it totally replaced. Be a dick, they will balk but you have their money. Demand a complete removal and replacement and bring them to the barganing table. You have the concrete, and you have their money, they did not deliver what was promised, so they need to do what it takes to make it right. Odds are they will be willing to sawcut and demo the ramp and extra 4' and pour you a new ramp and complete the 4' gap behind the existing slab. If they offer this, make sure they drill and epoxy dowels in the connection.
DO NOT PAY THEM UNTIL YOU ARE HAPPY.