A company called Zügeln Zürich – Your Best Movers GmbH came to clean the house before my friend moved. They did very little cleaning and although agreed for 500 CHF for a single room and a small garden, they carged 1000 CHF.
And they also forgot to take their cleaning bucket and no one even came to pick it up since 2 years. I reported them uncleaned areas, they did not care.