constantly being bullied at work but I get written up

for the last year and a half these 3 specific coworkers have insulted, ridiculed and belittled me. I've filed multiple complaints against these 3 but nothing has happened and today I was given a final warning about MY behavior where they sited instances where I verbally lashed out by speaking harshly to them because I couldn't take their bs anymore those instances. Literally everything I was written up for were for things they did and no one will listen to me