Can I refuse to work that extra shift?

Questioner

I have a specific (1-year) contract with a security company for 120 hours (security collective labor agreement). My schedule is sent 1 week earlier, I am called for extra shifts (hours) and I take them with me, so I work more than 120 hours/month. A week later after receiving my schedule, I was called for extra hours for Thursday September 23 (that day I already have a regular shift from 07:00 to 11) and I refused because of preparations for my exams on Friday September 24. A day later I received an email from planning with a title: wrong schedule and I was simply scheduled on September 23 for an extra shift from 18:00 - 22:30. Legally, I can still refuse to work that extra shift, what are the legal consequences? Can I still make agreements to only work 120 hours and no more? Thank you in advance

Lawyer

In this industry it happens more often, I know, but legally I see no grounds on which your employer can hold you accountable for this. There is an agreement between you and your employer for 120 hours and you can point this out to your employer. If you work more than 120 hours, all additional hours you work are surplus to requirements, i.e. more than you need to work. The planning was wrong, is a mistake of the employer, not of you. In addition, as I read your message, it concerns an extra service, not a regular service. You also indicated by telephone why you are refusing it. Keep me informed if you still need help with this. My phone number is 06-15250102/ j.voots@smartcapacity.nl