Racoon hair matts & is continually shedding

I have had Racoon hair extensions put in a week ago and I am so disappointed. The hair is shedding continually and I have lost quite a few of the bonds. I have been back to the salon but she advised I buy more hair to put back in so I have called Racoon direct and they do not want to know, I paid over £500 for these extensions and I feel so upset as nobody wants to help. Know speaking to friends I have been advised that Racoon is known for shedding. Can anyone help