Counterfeiting on Showroomprive.com

Hello,
I just bought a pair of Yves Saint Laurent glasses for 49.00 euros (instead of the actual price of 315.00 euros) and as soon as I received them, I wondered why there was no certificate of authenticity, which I find normal for a so-called luxury product. I called Showrooprivie.com, and they told me that there was no certificate for "end of series" or "declassified" products, which I found very, very surprising. Moreover, I pointed out that the case was made of cheap soft plastic, which I also found strange for a luxury brand! I already had serious doubts about the quality and authenticity of the product (I immediately thought it might be a counterfeit), but I still had my optician fit my prescription lenses (corrective lenses, of course). I wore my glasses for barely 10 days, plus I only use them for reading, writing, and the computer... last night, while making a gesture, they fell (a gentle drop) onto my desk, so just a small fall of a few centimeters without any violence, and they broke at both temples like glass!! They literally "exploded"; I was left speechless! I immediately called Showroom.prive's customer service, who asked me to send them photos, which I did, and then they asked me to return the pair of glasses (but what about my prescription lenses? So I haven't done that yet). Today, I received an email from the site saying that the deadlines for returning the glasses have expired, and they are offering me a compensation gift voucher of 8 euros!!!!!!! I intend to file a complaint and alert the DGCCRF, customs services, counterfeit services, consumer services, as well as the Yves Saint Laurent house!!! I am sure it is a counterfeit; it is impossible for a pair of glasses to explode like that!! Has anyone else experienced this type of issue on the showroomprive.com site?? I've read testimonials from people who had problems related to counterfeiting on their site..... Thank you for your testimonials!!!