Infested with bed bugs demon bugs plz help?

it all stated out with my sister a few months ago this year kept waking up with bites but no one payed to much attention to it. a few months past and the problem got worse they found out what it was it was bed bugs....as time past by we did not know what to do it reached were we could not even sleep anymore.we got are apartment fumigated but it did nothing now the problem is really bad my parents sleep in the living room were they have two sofas it was infested.we have spend plenty of money trying to get rid of them but nothing seems to work poison mother earth etc....nothing works we called the city on them but they wanted to fumigate are apartment again but i know that doest not work i have spend days trying to find out how to get rid of them and the manager wont do anything proactive.has gotten to the point were i don't sleep and think of burning the **** down i think is the whole area........