If you and the sender of the invoice have agreed that the invoice should not be paid, that agreement is what applies. You can feel confident in that.
Kivra does not receive information when an invoice is changed, updated or canceled. We function as a digital mail carrier so we deliver the mail, but we are not notified if any changes are made after the fact.
If you do not wish to keep the invoice in Kivra, you can Delete it or Mark it as handled. Open the invoice to find these options located next to the document.