cleaning dust from fabric/linen couch

whats the best way to clean the dust out of a couch? this thing has to be at least 7 years old, and dust flies off this thing resulting in extreme sinus issues for me. We have vacuumed the whole couch , and taken the pillows for a beating outside . The pillows will remain outside in the direct heat in hope for dust to come off. Although i can still smell the dust when i sit on the couch.

Is there any way someone could guide me for the best way to get the dust out of it?

otherwise are their any good services in bangkok for me to call?

thanks everyone, cheers