A few questions:

Are these species roses? If not, even if the grow, they will not produce plants like those the seed came from. All named hybrid roses are grown vegetatively i.e. from grafting or cutting.

If they are species roses what have you done already to get them to try to get them to grow.

I am afraid that anyone selling rose seed is basically a charlatan UNLESS they clearly name the species, explain how to grow them and warn how long it will take to get a flowering plant.

Here is a reasonable overview of what you need to know.....

Here is a link that might be useful: Roses from seed