Lab development mistake, photographer error, or bad film?

I have been into (digital) photography for over 7 years, and recently got into analogue photography, so I would like to say I kinda know what I'm doing haha

I have shot film before, and had my housemate develop it for me, and it has come out PERFECTLY. Using this same exact catlabs 320 film, as well as HP5

this was a really special photoshoot for me, so i wanted to get HiRes scans and guaranteed development, so i took this roll to a local lab, payed $45 and the result was like 5 usable pictures that they delivered as digital scans - even these were super over or underexposed, so i knew something was up and asked for the negatives.

Half of the roll is underexposed, half of it is overexposed. There's a lot of dark blotches over the sprockets, and the metadata(?) i.e. film name/type and frame count have inconsistent darkness, for example the start of ,,catlabs" will look darker than the end of that word.

I have other film rolls that my housemate developed that were used on the same day, on the same camera, and those are flawless, and I know my camera is not at fault.

This film sat in a dark box in the closet for 3 weeks before getting developed, alognside some colour filmed that also sat 3 weeks, and that came out perfectly.

housemate agrees that this is a lab developer error, as does another photographer friend, but I'm looking to get some other opinions before I go yell at the lab for a refund and ruining my pictures haha