I also received a text message after my account was cancelled.

According to the meaning of the question, we can write the answer like this. There are two reasons why you can still receive text messages when your mobile phone number is cancelled:

In the first case, if there is a delay in the cancellation in different places, it may be that the SMS is received within the delay.

In the second case, if you cancel locally, you can still receive SMS. You can consult the communication company that handles the card.

Cards that are normally cancelled can no longer receive information.