my legal rites

[windowsvista]

my reason for wanting to leave is due to the hours they have now given me,my hours where 9-3 mon-fri due to me having a child already and this was agreed in a contract,they then changed my hours and i was told that by law i had to do a weekend the hours being 8-8 sat 8-8 nite shift then 8-8sun,then i had to do a 5day week of 9-3,and now again they have said my hours are changing to ones i can not comply with due to being a lone parent.