I had filed for this application in 2019 SeptemberKeep in mind I don't know specifics of your case (and you still haven't answered - are you living together? have you been living together for more than a year, in Canada?) nor how your consultant handled the file or why.
But overall - yes, provide all the info as suggested above and whatever you can think of to support genuineness of your relationship and the reasons parents / relatives did not attend.
Now specifically on the form: I don't know that there is any specific benefit to re-doing and re-submitting the form with just these two questions, as they are the relatively broad "is there more information you wish to provide." If you wish, you could write a short letter of explanation noting that you are now submitting information that relates to [question 9 and question 11 if those are the right numbers.] You can also note that you are unhappy with how little the consultant provided on these questions and that it was a mistake on your part to rely on their advice - but keep this complaint SHORT. Focus on providing facts to the IRCC.
I have no opinion on whether you'd have any luck pursuing some action against your consultant or whether it's worth the trouble - but for the time being focus on providing facts to IRCC that support your case.
It really is relevant whether you are living together or not now - as an established married couple, recognized by friends, extended family, 'the public' (landlords etc), joint accounts and things like that as well. If you can't get info/support from family, from friends helps. If you've been living together for more than a year, especially.
Different situation but in our own case we showed a variety of events we held for friends/family beyond the formal ones listed even if they were small. As I noted as an example, if you have attended events of friends (marriages, christenings, whatever) as a couple and have photos or letters/evidence to support, that is a type of evidence that you are seen as a married couple (i.e. when friends have 'life event' ceremonies, you're invited as a couple).
Me and my wife are living together since July of 2019.. I don’t have any blood relation here and only two friends, also due to pandemic and even before that we didn’t travel anywhere or went to any event because my wife is supporting me, she is been doing two jobs ever since. We are barely paying out our bills. We are not accepted by our in laws as well, as discussed earlier I tried approaching my mother in law she is ready to write a letter that she is accepting my relationship
Would that work?