Frustrating - Avis employé Services ASDA

They constantly badger colleagues for overtime because they employ us on small contracts. My contract hasn't been accurate for over a year and nobody has fixed it. Holidays are almost never granted (from weeks to single shifts), even when requested months in advance. We are either massively overstaffed or understaffed. Every process (being added to a system, being given electronic access to an area or keys, being properly trained on almost anything, uniform requests) takes far lo her than it needs to. Discount cards are rarely distributed on time (mine was around 7 months late)