@Brainteaser ..I second that. Probably an attorney can see what experience letter you submitted and compare it with the Job duties of NOC code 2141. If there is a match, then you stand a chance to request IRCC to re-consider.I am so sorry to hear this. Refusals were so unheard of previously and now it's happening every other week. It's so annoying and disheartening especially after 8 months of waiting. They should at least give you an opportunity to plead your case.
Like others have said before me, you should contact an attorney to see if you can appeal the refusal. Although I agree re-applying would be an easier option since you have gained experience in these 8 months.
One thing I did not understand is if Officer can send ADR to you for Pay stubs and tax returns in September, why could not they send another one asking clarification on job duties based on NOC you selected.