If it was your fault, I would suggest trying what you are suggesting, but since it was a company who did this, I would push for a correct fix. If I get the gist of what you are saying, the pipe was lifted outside the building, causing it to be lifted inside as well? If water pools in the droop, any debris, oil or grease will pool there as well and will likely cause a problematic drain (In my opinion). I think your best bet would be to have the concrete guy come in and saw cut the floor and remove a section to access the pipe and be able to replace it (make them put a new pipe in) to the correct grade. Make the cut to access the pipe as simple as possible (ie. cutting out a corner of the slab or a trench, stick to a 3 sided cut no zig zags). Make sure the material around the pipe gets compacted well, every 9"-12". Then pour concrete to patch. Good luck!

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