If you buy 1000 shares in company XYZ say on Monday at $1.00. The transaction is executed so you received your contract note
The next day there is a Trading halt so the three days for completion of money transfer has not been finalised.
Are you the owner of the Stock because the contract note has been received or
Because the trading halt has occured the transaction is cancelled as no money has been paid because it occured within the three day period.