Why do you say that compensation will be paid undoubtedly? Compensation is paid by the operating carrier, but in this case the OP had no ticket so IB did not accept them for the flight. I don't think IB is liable in this case. Any recourse should be against AA, which screwed up majorly here, but I don't know how the OP may claim compensation under the EU Reg from AA for the failure to reissue the ticket.