I have 30 pages in my website but now it's showing 3000+ pages indexed in Google

I have created 30 or 40 pages of my website. but yesterday I search is google with site:mywebsitename.com and it shows 3000+ links are indexed in Google. when I check some links every link is created like [ mywebsite.com/Radsport-Salomon-ADV-Skin-5-Set-schwarz-Rucksack-Trail-L-w493244/] and all links are redirected some other website.

My questions are how is it possible? Cause I've my website access only. So how someone can create those types of links for my website and indexed it too....

I have 30 pages in my website but now it's showing 3000+ pages indexed in Google

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