You do not understand what Onyeeze asked. He is asking question about double spending. That if a bitcoin transaction has not been confirmed, and he later knows that he sent lower than the exchange deposit limit, that can he cancel the transaction if not yet confirmed. If you send lower than the exchange minimum deposit limit, the exchange will not credit your account.
All you said are correct, and I understood his situation, but I saw that his post provides incorrect information about his situation.
Read my post, you will see I described that if your deposit transaction is not confirmed, some exchanges don't show it as Pending. Even it has 1 confirmation, some exchanges don't credit it to your account, if they require like 2, 3 or 4 confirmations and with only 1 confirmation they will show that deposit as Pending, or In progress. Some exchanges can show a not confirmed deposit as Pending but not all exchanges have this policy.
1 confirmation is a very least condition from a user, before they can start to wonder why an exchange shows their deposit as Pending.