A clear complaint or a formal legal notice for deficiency in service or a defective product — with your demand and a deadline. Free, and processed privately.
Start with a firm but polite complaint letter. If the business does not resolve it, escalate with a legal notice that references the earlier complaint and gives a final deadline before approaching a consumer forum. Keep copies of bills, chats and emails as evidence.
Note: consumer laws and forums differ by country. In India this typically falls under the Consumer Protection Act. This is a general template, not legal advice.
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