Many people have experiened this as I read in reddit posts made by different people with the same problem and not one of them replied about getting their btc back from where thet have sent it to. You are lucky that you are able to get your coins back but I don't know what will might happen if you have sent it to a wallet address that you own instead of an exchange wallet address.
Though all exchanges warn you won't get coins back from the wrong addresses and have a disclaimer saying so, some will sort you out. I can't remember which one it was, but one exchange bills customers $200 an hour for the work required to recover wrongly sent coins.
Even if it does happen it's worth contacting them to see if they're willing to do anything.