The pay slip is wrong. Cause I started working on the first of June till the 25th of june. And my first day off was friday, and my second day off was Wednesday

The pay slip is wrong. Cause I started working on the first of June till the 25th of june. And my first day off was friday, and my second day off was Wednesday and so on Wednesday. And I didn't work once on Wednesday, because at that time I wasn't feeling well.
And on the pay slip, my working day is only written 20 days, it should be 21 working days.

Are Those sentences true or false?
Thanks.