If your deposit was not protected (or your landlord didn’t protect it for 30 days) you can make a claim against them and take them to court. In most cases the claim itself is satisfactory for a landlord to settle and you will receive between 1 – 3x your deposit back.
If they don’t settle then Deposit Hero are happy to take them to court on your behalf.
To check if you’re entitled to your deposit protection claim complete our claim checker here.