The Housing Executive has a legal responsibility to help homeless people. The amount of help you're entitled to depends on whether you pass 4 homelessness. The tests look at whether you are homeless, why you are homeless, whether you're entitled to help and whether you're in greater need of help than other people.
If the Housing Executive decides you've failed one or more of these tests you have a legal right to ask that this decision be reviewed. There are strict time limits though, so you need to get advice and act quickly if you're going to challenge the Housing Executive's decision.