Explanation:Quackery is a Deliberate misrepresentation of the ability of a medicine, a machine, a substance or a person to prevent or treat disease. It is may claims that you can alleviate something. It can also mean practising (Medicine) something when you have not being permitted by law or the governing body of that association to practice.
But from the question, they know that the health product is not effective yet they are selling to make profit. That's Quackery from the first definition given because their action was deliberate.
It's very easy for things to go awry when there is nothing documenting the agreement between the parties or variations to that agreement. That's why it's important to ensure that any agreement you have, whether with an employee, supplier, customer or business partner, is captured in writing and any variations to the original agreement are also documented, approved and signed off
