most of the blurry ones were taken in front of a mirror im not sure if that had any effect on the photo, but there were other photos in the roll that were also taken in a mirror and turned out perfectly fine and really good quality - so i would say maybe 1-2 feet away from the mirror

If you were using a camera like this: https://www.fujifilm.com/products/quicksnap/lineup/superia/

This camera has a 32mm f/10, fixed focus lens. What this means is that the camera doesn't focus on anything in particular, everything from 1 meter away to infiniti is acceptably sharp. When you photograph things closer to the camera than 1 meter, not only do you suffer some parallax problems, but these objects are out of focus - with the out of focus blur worsening the closer the object is to the camera.

It is tough to tell from your statement, but it sounds like this could be a culprit. If not...

Then it is likely the scan of the image messed up. It doesn't make a ton of sense to me why one frame would be good and the next blurry...but the problem is either in your shot or in the scan. Since you don't have the negatives, the world may never know.

If you are certain that your images should be fine, you could always attempt to demand your money back and a consolation camera/roll of film for the ruined shots - there's no way to resolve anything out of the images you've posted and, if the negs are destroyed...well, gone is gone.

In the future, always check to ensure that you are using a lab that will give you your negatives back. There is, generally, at least one decent lab in any major city and good labs that you can mail your stuff to who will mail back your negatives.