Well, if it can be automatically adjust as long it is up to their minimum transaction limit, it will be good because such mistakes might not be intentional, mistake can happen; but for them to be able to also handle it manually, it shows they care.
I have used Baltex several times, but I used to send the exact amount to the wallet address being given and after sending the exact amount, the transaction will just proceed within minute.
TBH, there are some discrepancies in the terms. I have read almost all of them, and maybe I overlooked something, but they have not said anything about extra funds I will send. Will they process the exchange accordingly or not? This should be cleared, although they have instructed everyone to send the exact amount shown on the screen, and sending the exact amount is not a big deal either.
I used it, and I sent the exact amount of LTC because the fee is covered by the remaining LTC, not from the amount I am sending. So their receiving address will receive the exact amount, and I also can't confirm what can happen.
Although they have said recovery can happen but if the fee for the refund exceeds the amount, then there is no guarantee. So make sure the amount you are trying to recover, which was sent unknowingly, is more than the network fee.
Also, you have to be careful when making exchanges because their policy says that if you are swapping and you choose the wrong network or send funds to the wrong address, then you might have to pay a $50 processing fee plus the network fee. So getting familiar with the terms and conditions is important for every single project, no matter if they are in the same category. This one here provides more services, so it's not the same.