A letter before action on poor quality product. This is to be sent after first complaint letter if the supplier / shop does not offer reasonable explanation / solution / deny liabilities.
I am afraid your explanation is wholly unreasonable and illegal under the law, for you as seller to sell such a product to the public which is unfit for its purpose and fail to meet yours sales description (both expressed and implied).
Neither had me as a customer been warned about the necessity to [PROVIDE UNREASONABLE EXPLANATION OF THE SUPPLIER] before the product became fit for use upon our purchase from you.
letter before action,
fit for use,