Sorry to hear that you are having issues with your travel agent. I understand how stressful this is as my FI and I are facing the same issue. Ever since we booked, we've had nothing but bad service. I guess the agents know that once they have your money you are stuck so you are no longer the priority!
I am also flying with ACV and part of the reason we booked was for the 'freebies'. Unfortunately it turns out these are all based on availability and in our case executive class is sold out on our outbound flight. We booked 9 months in advance but I guess that wasn't early enough so we only get the upgrade in one direction. This is really unfortunate as we needed the extra baggage allowance! For future brides, apparently the TAs need to send in paperwork for you to get the upgrade, so make sure they start requesting it as soon as you book.
As for other promos, I strongly encourage all brides to do your research and get supporting documentation for everything you are told. Also read the fine print...we had the same situation where people ended up booking through different TA's etc. so their reservations don't count towards any of the totals.
Also check to see if your hotel has any promotions. For us, we didn't know if we would have enough ppl to get two AC 16th person free promo so we did a hotel promo where every 6th room is free. Choose whichever promo works best for your group and keep in mind that not everyone will book through your agent.