France played nine five-metre scrums after Wales were penalised in the 79th minute while leading 18-13 but, despite their utter domination, were never awarded a penalty try.
Damien Chouly eventually bundled over the line after 20 minutes of added time and Camille Lopez converted to give France their third win in the championship.
"He (Barnes) told us we were not dominant enough," Maestri told reporters. "Anglo-Saxon referees always talk about fair play but the reality is that they think we're cheats.
Read the full article on eurosport.co.uk: France's Maestri hits out at referee Barnes after Wales win