Trouble harrasment when renting a room?

my dad rents a room in SF and some other renter there harasses him constantly. he tries to raise the rent on my dad even though he is not the owner of the building (the guy has gambling prob. so he tries to get money from all the people there). is there a number he can complain to, besides going to the actual... show more my dad rents a room in SF and some other renter there harasses him constantly. he tries to raise the rent on my dad even though he is not the owner of the building (the guy has gambling prob. so he tries to get money from all the people there). is there a number he can complain to, besides going to the actual landlord? like a fair housing authority or something?
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