All you can do is leave appropriate feedback. Be warned that many of the type of item you bought are cheap, sometimes counterfeit, Chinese rubbish and even if they work initially you will be unable to use them for very long before they fail. One of a long list of things I would not buy on any auction site unless the seller had a verifiable ABN and impeccable feedback.
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It says in this book I am reading that by 2065 80% of women will be overweight.
See what a trendsetter I am?