notice to terminate based on "illegal sublet"

[mrvertigo]

i recently subletted a stabilized apt.from friend who is staying in s.f. for 2 yrs. she/we followed procedure but landlord being what he is...played games and eventually refused me as sub-tenant. i moved in after many delays(1month later)and after 5 months he sent a "notice to cure." i am still here and just recieved a "notice to terminate" from his lawyers after expiration of cure notice.
he's claiming primary residency as reason, LL not giving consent(though he told her initially he'd work w/her, then obsfuscations began), that i moved in w/out consent etc.
what are overtenants and subtenants rights regarding this?
what can we do as per the courts do wherein we will surely find ourselves? i cannot afford a lawyer nor she what's to do w/this unjust case?
much appreciated.