I am afraid no matter what kind of advice we can offer, do you think your "landlord" would take any notice? You yourself smell a rat. Any steps that you may want to take, can endanger you or expose you and your possessions to mis-treatment.
Landlord or an agent
must not enter your room without your permission (tresspass), threaten you in any way (harassment, illegal eviction). Subletting of social housing is very often strictly prohibited.
You are on a very thin ice- I would suggest you contact your local council's housing advice service in order to find cheapest way of getting away from current mess. Some councils run deposit schemes or have a list of l/lords who'd accept tenants with a local authority security bond.
You can try
Shelter: Advice services directory to find your local point of help.