Brokers receive multiple calls on their listings and from time to time they may be delayed in getting back to you. We often give listing brokers a courtesy email if we notice that there hasn’t been a response, but ultimately, we have no direct control over their responsiveness.
If your inquiry is not directly related to leasing space (like questions related to building maintenance) it’s best to call the property manager as listing brokers are likely unable to address non-leasing inquiries.