If you want real safe solutions, use cold wallets. The problem is only that they not support all of the altcoins. Ledger or Trezor is a good choice. Cheers 
Be careful when buying this wallets because there's some people out there that's scamming people that buy these products by selling a tampered cold wallets so you better be smart as to where you're going to buy, buy at their official websites and stores and not just from individuals that's saying that they're selling it for a lower price.Have you ever had this bad experience, friend? It seems that if you share your experience of how the problem occurred, it will be more helpful for someone new so they don't repeat the same mistake. I realize that security for cold wallets has received good feedback from many people, but with rumors like this, I have doubts about your statement.
I don't take lightly the warning you gave. However, I am a little surprised about this, because there is also a bad possibility for someone who wants to buy a cold wallet like Trezor and Ledger. Spontaneously in my heart I said "What... how could that actually happen?"