Hi helysr,
I mentioned this in response to your other post, but it bears repeating:
First off, a 750/Q49 is an outstanding Score, so you can comfortably apply to any Business Schools that interest you. As such, a retest is not necessary. Many Business Schools have publicly stated that they do not use an applicant's IR score when evaluating an application, so you likely have nothing to be concerned about with an IR3. That having been said, if you're interested in what a specific School/Program thinks about the IR score, then you should research that School directly (you might also consider contacting the School to ask). Depending on the Schools that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/Assuming that the Test Moderators investigate your claim and find that it's accurate, the issue then becomes how 'impactful' these errors are (and to a certain extent, how often they occurred). If just 1 prompt was incorrectly designed, then that's a negligible issue - and maybe the question might be 'thrown out' and your IR Score recalculated... or maybe they would offer a free (or discounted) retest. If the issue was far more frequent/severe, then a free retest would be far more likely. All things considered, regardless of the outcome, you've got an outstanding GMAT Score and you should not hold back from applying to any Schools that interest you.
GMAT assassins aren't born, they're made,
Rich