Dear all,
We would like to ask for any kind of advice on the major issue we have with our landlord at the moment.
We moved into this apartment in october 2008.
And since then the landlord himself with his wife have been doing the renovation of the building(other apartments) until december 2009.
That was for about a year and half including WEEKENDS!!

There are 10 apartments in this building and more than half was empty when we moved in and they started to renovate one by one.
There was no clear or set renovation plan. Sometimes they would post it on the entrance, other times not.
They would also have breaks in between which of course are not shared. Water was cut pretty often during the day with a notice that was often put the night before after 8 or 9.
Drilling would go on for weeks non-stop not to mention hammering or axing.
Horrible smell of paint or all sorts of chemicals fill the building most of the time and there's always this crazy pile of trash near building entrance.
It wouldn't be hard to imagine the noise and unpleasantness I had to bear as a housewife.
I mean who as a tenant wants any trouble with the houseowners?
We've been more than patient and had to complain about the weekend noise at least to the real estate agency.
We weren't really up for any fights hoping this would end at lease within 6 months.
But then the owners would visit us right away(i mean they are in the building all the time anyways) to show how they are grumpy about our complaints.
Is this normal for them to come right back to us like that?
That was the start of annoying circle communication among <us-agent-owners>. Plus, this agent wasn't availble most of the time and was hard to get a call back.
Apparently we are the weak party here and unexperienced.
My husband is Swiss lived in zurich for over 15 years but never had this kind of problem before.
One time we informed the agency about the disgusting cockroaches (additional 2nd issue) possibly coming from the other empty apartments.
Even the agency agreed that the right measure have to be taken with this matter.
But the next day the owners appeared on our door asking if i could show them the roaches???
Seriously, I had to say 'sorry but i don't KEEP them as pet.'
So, they requested me to catch it alive next time or not squash them totally for them to see it for real. wow, I was speechless.
But fortunately I did spot one on the third floor stairway that day
and managed to prison it using an empty glass jar with a note, <for the landlords, please do not touch>
Next day they left us an insect killer spray saying after observing that roach, they concluded it was HARMLESS FOREST-ROACHES and
would all go away to the forest when the winter comes....(you mean like migratory birds, right???wow)
We honestly gave up reasoning with them, and just kept on searching for different apartment.
But as you know to get an apt in Zurich is just a war.
We tried to get some advice from friends and family or any experienced.
We even consulted Mieterverband about the situation
and found out that normally and legally they should give us 10-20% of the rent back for those period of renovation. We just had no idea about it before.
We mailed asking for the rational suggestion from their side weeks ago but just got an angry call from the real estate agent and no formal reply so far.
We are totally ignored and fed up and frustrated and helpless.
What could be the next step? What does the swiss law imply?
Would there be any democratic and reasonable resolution for helpless tenant like us? I'd rather donate that refund for the people in need then just leave it and move out as my husband wants. He just gets too stressed out dealing with trouble like this.
Do any of you have experience like this?
Please help

!!!