متن اصلی - انگلیسی - Faulty headset.

You asked "english to english", is this what you really want?

yes, I want a correction of this text.

As a native English speaker, I see nothing wrong with the text as written, except perhaps a small ambiguity: who has to replace the faulty products? Is it Southwing, the German distributors or the retail shop? Also, who is the agreement between? The shops and the distributors, or the distributors and the manufacturer?