Apologies if this is a very dumb question, but if I got an email saying "the wireless number ... is no longer associated with user ID (my email)", does that mean my Prepaid plan has really been canceled?

So yeah, basically what the title says. I was an international student in the United States, now I'm no longer there and I have no more use for my AT&T Prepaid plan. I couldn't access the AT&T Prepaid website from my country, so I sent a message to 75421 asking them to cancel my account. Then I got that email. Does this mean my Prepaid plan has really been canceled?

Sorry if this is really dumb, I just want to be absolutely sure my Prepaid plan has been canceled and I no longer have to pay 65 dollars for something that I don't need anymore lol