What general advice would you give to a retailer when you are very dissatisfied with a service that you have purchased?

Incomplete question. Answered from a general perspective.

service improvement

Explanation:

It is important to remember that every customer wants to receive value for their money. Hence, when the expected value derived from buying or selling a particular service or product fails to meet a customer's expectation it may result in negative customer feedback.

Retailers are often generally advised to make service improvments based on the feedback they received from their customers.

i guess you could put raise the economic balance

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