Is the landlord registered and is your deposit with a registered scheme?
They should be in both. Read the advice from [Shelter](https://scotland.shelter.org.uk/housing_advice/complaints_and_court/complaining_about_a_private_landlord)
You can find details on how to search the register and contact the council [here](https://www.glasgow.gov.uk/index.aspx?articleid=18312).