Fogged film is more likely due to exposure (like a light leak in the camera or too much light during development).
Either way, once it's developed and fixed, it's done. But if this was regular color negative film, I wouldn't judge fogging by the prints they make at a local lab. Negative film is inherently low contrast, and most labs these days give you prints by scanning the negatives and printing digitally. So I'd suggest getting high end scans and converting them to positives in Photoshop, and editing as needed.
Negatives are designed to be low contrast, which allows more contrast control using traditional darkroom development (and allows the enormous dynamic range of film). So a contrast-adding process needs to be added in at some point, either darkroom printing (which expands contrast) or in a digital workflow.