How do I email screenshots and chat transcripts?

I have screenshots and transcripts from multiple chats with a number of different agents about a billing issue. In 2 separate conversations I was told that my incorrect bill would be resolved in 24-48 hours. It’s been 2 weeks and it is STILL incorrect. I have screenshots of the confirmation screen on the website showing what my price SHOULD be and chat transcripts of an agent confirming it. However, I cannot find a way to submit these to anyone. When I call/chat I am now told that there is no record of these conversations and they can’t do anything. I am at the point where if this cannot be resolved before my billing due date, I will have to retain a lawyer to prevent going to collections over a bill that isn’t even accurate. 

WHAT IS YOUR LEGAL DEPARTMENTS EMAIL ADDRESS??? 

DO NOT tell me to contact you via chat or phone. I will not discuss this with anyone other than a legal team.