This is simple, If you want to completely avoid this kind of problem, just don't go to the unknown crypto exchanges. rather read some tips from trusted sources where you can buy some altcoins that have some real volumes and cryptoexchanges that have some real users. Because if you just blindly choose exchanges from the internet, you might fall to the trap of the scammers where they will beautify their sites to make it look real and will fool you to buy their fake volumes shit coins.