Actually the payment is 3 weeks for every year worked, not a month.

The Labour Law changed in 2004, previously there was a sliding scale whereby you got more payment for every year that you worked (and the payment was based on full salary not just basic).

If you get your hands on the old law you could arugue to your employer that the previous law applied up until January 2005 when the current law was enacted. Worth a shot.

Tresgandas your calculation would come out to be the total salary paid, not the EOSB amount.