1. Previous Communication: Reference to any previous attempts to resolve the issue, used when there has been prior contact

2. Consequence Statement: Statement about potential legal action or escalation, used when the issue is serious or repeated

3. Payment History: Overview of payment history to demonstrate good standing, used when relevant to strengthen the case

4. Market Comparison: Information about standard market prices, used when the overcharge is significantly above market rates

5. Account Termination Notice: Notice of intent to terminate services, used when considering ending the business relationship

1. Copy of Disputed Bill: Photocopy or scan of the bill showing the overcharged amount

2. Previous Bills: Copies of previous bills showing normal charging pattern

3. Proof of Payment: If bill was paid, documentation showing payment of the disputed amount

4. Supporting Calculations: Detailed breakdown of why the amount is considered an overcharge

5. Related Correspondence: Copies of any previous emails or letters regarding the issue