bitcoin.com has been scamming people for a couple of years now, they advertise that they are selling "bitcoin" but when beginners like you that aren't familiar with certain details go there and buy "bitcoin" they end up with an altcoin that this site has created and owns called "bitcoin-cash" and is trying to sell in the name of bitcoin because they have no other way of getting people to buy their shitcoin.

sorry to say that you were ripped off.