i put human hair extensions in a client 1 month ago. She came back after 2 weeks to have them checked and all was good. She then went on holiday to Tasmania and was staying on a property that pumps some water from the creek and rain water in a tank and washed her hair in it and the extensions matted. She visited a salon in tassie who have signed a form to say extensions are fake and now she is demanding her money back. I tested remaining hair in same packet and it is smells like human hair when burnt and have a certification certificate from my supplier. Has this happened to anyone else? should i refund money or offer replacement as she is very angry