Raw sewage overflow

For almost two months, neighbors and I called#311 to report raw sewage coming from the street vent in front of 44 Leland Ave, a laundromat with two apartments upstairs. Workmen from the Sewer Department probably came a few times ONLY to flush this vent and the small area around it but ignoring the contaminated areas all the way to Bayshore & Leland Avenues. One of the #311 Operators told me that regardless of the number of complaints, ONLY one complaint number is filed within the 24-hour period thus frustrating neighbors with this disgusting problem which continues for almost two months on our little commercial street. Finally, by complaining to several City department personnel, I was able to get the City to dig into the area and locate the problem -- probably since yesterday! QUESTION: Why does #311 take almost 2 months to get this problem addressed? We still don't know the extensive effects of the contamination on the City-planted trees etc.,