T-Mobile Won't Confirm Cancellation of Service

I spent three hours trying to cancel my two lines and home Internet service. Finally reached an overseas CS Rep, he said he cancelled it all, but 1) I would not receive any confirmation e-mail and 2) it would not show up on my t-mobile dashboard as cancelled -- until the end of my billing cycle (two weeks away). (I realize there is no early cancellation refund. I simply want to ensure I will not be billed again when the new billing cycle starts.) It this correct as rep asserted that T-mobile's policy is NOT to send such? (Every other company I have eve dealt with sends a change of service notice right away.) I question it because I have had a six-month bad spell of t-mobile staff saying one thing and then the action or policy being denied by others at t-mobile later.