1. Previous Communication: Include if there have been prior attempts to resolve the issue, detailing dates and outcomes of previous contacts

2. Legal Rights Reference: Include when the overcharge is significant or when the company has been unresponsive, citing relevant consumer protection laws

3. Consequences Statement: Include when escalation may be necessary, stating potential next steps if the matter remains unresolved

4. Service History: Include if you have a long-standing relationship with the company or if service issues are related to the billing dispute

5. CC Recipients: Include when copying the letter to regulatory bodies or consumer protection agencies

1. Copy of Disputed Bill: Attachment showing the bill in question with overcharged amounts highlighted

2. Payment History: Documentation of previous payments and normal billing amounts

3. Proof of Correct Rate: Any documentation showing the correct rate that should have been charged (contracts, advertisements, etc.)

4. Communication Log: Chronological record of any previous attempts to resolve the issue

5. Relevant Receipts: Any receipts or documentation that support your claim of overcharging