New house - garage door does not seal at the floor

[Dan Marl]

Hello everyone! I am buying a new house from a builder and during an inspection from the professional inspector, he noticed that there is a big gap at the bottom of the garage door on both sides (see picture). 

The inspector said this is not good because rodents from the outside can get in (plus dirt, leaves etc). I brought this up with the builder and they said the driveway has to curve down on both sides  a little to drain out the water.

They said it doesn't usually curve this much but concrete can be unpredictable. Sounds like they just want to install a weather strip on both sides but this will probably fall off after 6-12 months.

Is there a permanent solution? Can they shave some of the concrete so it's flatter? Sounds like they don't want to spend the money to fix it. Should I push hard for it?