Just to get this pay figures correctly.
Base pay is 20.000 Euro a year before tax = 1666 a month.
Deduct 1000 Euro of this for 15 months, and you have base pay of 666 Euros a month.
Add sector pay, approx. 30 Euros a sector, which can be from 16 - 30 sectors as median averages.
If you are sick, or holiday, your base pay is 666 Euros a month, if you on a local contract. If you on tax evasion Swiss contract, you will be deduct sick days from your base salary. But happy days for your holidays, you will have 6 66 Euros a month for that. Good luck to survive on this!