Did you find an exchange through Bitcoin.com? Which exchange did you use? Perhaps the transaction has to confirm first before you see it in your wallet. Did whatever "company"/exchange you use provide you with some sort of transaction URL? That would be the proof that shows the coins were sent to your wallet. What wallet are you using? Lots of questions I know but let's try to track down these coins for you. Welcome to bitcointalk and the crypto world, by the way.