I worked for company for 5years. My old contract stated I am eligible for holiday pay-however, after I came back from maternity leave I started working 16hours a week and signed paper stating I’m changing hours (there was no details about holiday pay or sick pay). Now I got sick thinking I will be paid- but I didn’t get paid. I never seen my new contract neither I signed it... I just seen one paper talking about change of my hours. What are my right ?