‘My union rep will be in touch’: Boss demands employee provide a doctor's note for every sick day but refuses to pay for it, employee gets the demand in writing, then files for grievance 

The beautiful thing about being an employee is that there is a contract for everything. Once you've gotten through a few places of work, you understand that everything you ever agreed on with your employer should be written down in your contract, that both the employee and the employer sign on.

 Once things are written down and secured, your employers can try as they might, but taking advantage of you should not be possible, and that is one important lesson you can learn from this Reddit story.

The employee here was asked to provide a doctor's note for every sick day they needed to take, in order to get paid for that day. Because of the signed agreement, OP (original poster) had with their boss, they knew that they were only supposed to get a doctor's note after three days of being absent from the job, and not from day one. After several arguments OP had with their boss about it, OP asked the boss to send an email with all of their demands, which OP then forwarded to their union rep as proof of the breach of their agreement. 

Keep scrolling to read the full story.  After that, check out this story of a manager who rescinded a job offer after the candidate couldn't start working the next day.