I was checking my hours because my advance at work was lower than expected, and found out that last month, they missed twelve hours. Took another check for september as well and over 20 hours were missing.
Wish I had a better note to check for July, to see if they missed any hours that month as well. (no need to check for august, since I was first on vacation and then on sick leave for most of that month.)
That's over 30 hours in total just for those two months, even with taxes taken off that should be over 200€ missing on my paycheck *grumble grumble*