WeightLoss$4$Less promotes a guaranteed weight loss of $8$ pounds in one week without dieting or exercise. Thousands of customers purchase the products and about $200$ call in with complaints that the product was ineffective. What action should WeightLoss$4$Less take?

It should immediately remove its products from the market, fully refund the thousands of customers' money, and close its business.

It should use persuasive techniques to get the $200$ disappointed customers to try the product again each time it fails in order to decrease refunds.

It should explain to the customers that they misused the product and try to sell them more of the product.

It should discuss the product failure with the customers and then provide them with a full refund of their purchase price.

It should ignore the customers' complaints and hope they will tire of calling and writing letters.