Concrete Floor

Homeowners wanted a stained and sealed concrete floor on first floor. No scoring. Subbed it out, was stained in March, sealed in June. Allowed to "cure" for 24hrs (sub's recommendation), and owners moved in. Now lots of scratches and scuffs. Can still see "lines" where the sealer was applied. Sub is now saying it wasn't allowed to cure long enough before traffic was brought in on it. Not really sure what he sealed it with. Some parts of the floor (like in the corners) look really good, but mostly not. Any ideas? Recs?