Pontaic clutch

This is a 1996 pontaic sunfire that the manaul transmission got rebuilt a month ago. The clutch was changed supposedly. when pushing clutch in it still grinds the gears. The fluid level is good. The pedal goes to the floor. What should I do?

This has a hydralic clutch so if the pedal is going to the floor and it is grinding going into gear then you could have a failing master cylinder or slave cylinder.

It’s also possible that there is air in the system so the first thing to do is to bleed the system and see if that helps.