Please tell us - does your lab return your negatives? You say you received 3 out of 24 - in what form did you receive them? I asked 3 days ago in post #4, what do the other 21 look like? Without this information, anything we tell you is just guessing.
If you did not get the negatives back and have nothing other than some digital files that look like what you posted, then you just need to start over with a new roll of film and pretend this one never happened. Make sure you insert the end of the film into the little slots and the rewind knob turns when you advance the film. If it doesn't, open the back up and make good and sure that the film is solidly inserted into one of the slots. when you're done, find a new lab that returns your negatives, or develop it yourself. If you can make Mac-n-Cheese from a box, you can process black and white film.
The X-370 may be considered an entry level camera in the MD line, but the MDs are what I shoot for 35mm, I have a half-dozen MD bodies, and the X-370 is one of my favorites. You have a very good camera, and it is not causing your problems.