When you cancel a paid AI bundle it no longer stops the same minute. It runs until the end of the period you have already paid for, Billing shows the date access ends, and a Resume button undoes the cancellation before then with no new checkout and no new trial. Before you confirm, Billing shows what your monthly total and multi-bundle discount become for the bundles that stay.
A bundle that was granted free ends straight away when you cancel it, because nothing was paid for it.
Billing now also shows offers. If SENTIREV has given you or the whole platform a promotional price, a longer trial, a lower shop fee or placement fee, or a free bundle, the page shows the price you are actually paying, the normal price crossed out, and the date the offer ends. Nothing is ever taken back when an offer ends; it simply stops applying to future charges.
On the phone the Billing screen shows the same things.