Dumc: I perhaps didn't explain myself properly.
They did not disable the other files. They rejected some footage on no basis and they claimed they couldn't reactivate it for me to apply any eventual modification and resubmit it. They said that the only option was to upload and tag again from scratch.
I said I won't because it was their mistake, not mine and that I'd leave the agency. Then, magically, the clips were ready to be tagged again and I've got two sales.
It was so suspicious that I started to doubt about sales too.
Btw, I'm asking them since weeks if they have in mind to implement CSV support because their tagging process is so long, especially if you have diverse footage. But no answer on that front.
Cheers everyone!