I also found it helpful to:
1. Report EVERY issue.
So, not every third issue, or only the worst. Every single one.
2. Report to EVERYONE with jurisdiction. So, in my region, a noise complaint could go to:
*police
*bylaw
*building manager
*landlord
Where the last two are different people, the latter may hear of nothing (from the manager) until you call directly. Strata, HOA, etc, may also have jurisdiction.
3. Report every single day. Report every instance, every single day, to everyone with jurisdiction.
4. Escalate the reporting.
Call each in the middle of the night. e.g., Some landlord's don't care about how their tenants are disturbing others until they are disturbed themselves. Police are often more available at 5am than 2pm or 2am. If nothing is happening via bylaw, put a written record of calls into the bylaw supervisor or to the city. Etc.
5. Encourage neighbours to do likewise. Often the powers that be will do nothing if hearing from only one person, or two. Engage as many neighbours as are bothered.