- Defect cost by production or service failure and employee mistakes.
- Marketing over promises
- Misleading marketing
- Customer errors and unreasonable expenses.
- Customer is incorrect but makes a reasonable mistake.
- Dissatisfaction on use of product and its effects.
- Poor customer services-rudeness.
- Discrimination in serving customers
- Customer exploitation in terms of prices, quality and quantity.
- Long time spent in responding to their urgent problems.
- Media-mainly social media.
- Phone calls by customers
- Mails sent by customers
- Internal employees.
- Analyzing the order history patterns
- Direct feedbacks.
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