Rain of sewage: two freelancers have suffered the tyranny of the neighbor above for 5 years

Two self-employed individuals in Molins de Rei have been suffering from sewage issues caused by their upstairs neighbor for five years. Despite multiple visits from local authorities, including the city council and firefighters, no resolution has been achieved. The neighbor's poor plumbing has led to raw sewage flooding their business premises, forcing them to spend significant time and money on cleanup. They have invested heavily in renovations but are unable to rent or sell the property due to the ongoing problem. The community has recently filed a lawsuit to address the situation, but the local government has remained silent on the matter.