Hello community, i wanted to ask that is there any place where i can buy large quantity of bitcoins like 15-20 bitcoins and remain anonymous at the same time. any help would be appreciated

I think you can buy it on the exchange, the stock exchange average still retains anonymity. like coinexchange, hitbtc, livecoin, on the stock exchange it hasn't implemented the KYC system so I think your anonymity will be safe.