Review on Office chair Bureaucrat CH-1300N, upholstery: textile, color: black 3C11 by Stanisaw Socha ᠌

I ordered a chair as a gift for my father. During assembly, it turned out that the holes for fixing the backrest were cut out incorrectly, not opposite each other, but diagonally, which does not allow fixing the back of the chair. Question to the seller, is it possible to replace the part, namely the back to the back with correctly cut holes? According to Step 3, part number 15 is not inserted due to mismatches. And if you try and drive in, it is impossible to fix part number 6 in step 2 according to the instructions. Attaching photo.