sorry to hear of your problem
its no fun when something like that happens.
tell me, on the edges of your negatives, do you see numbers ( frame numbers ) ?
if the answer is yes then it was a user error, maybe the film was loaded wrong, maybe the camera
malfunctioned &c ... if there is nothing on the film, ... frame numbers &c it might have been a lab mistake.
frame numbers mean the film was processed correctly ... can you post a skan of a strip of film ?