Trolled by 4 man in norms

Just got out of a game where the Sona was refusing to heal me with w. I asked Sona at level 5 if she could put a point in w but Sona doesn't respond. I ask why Sona won't heal me or ult then eventually Sona says "we are a 4 man we don't care". Now everywhere I go Sona or someone else is stealing my farm. I ended up just farming jungle all game which will probably get me banned. All the players on my team were plat btw.