Nightmare cancelling contract - tip, don't accept any special offers when you want to cancel

Contract ended in Sept 2019. I called in June to cancel contract and transfer to prepaid, the consultant proposed a migration to a cheaper contract with 10gb of data, and it will remain month to month so i can cancel any time. I was migrated but never received the Data. I called today to cancel the contract. 1 hour on the phone being transfer from person to person. Cancellation department say they cannot cancel, they will transfer me to some else that needs to reverse the migration. The next person says no need to reverse migration it can just be cancelled, i get transfered back to Cancellation dept, EXPLAIN EVERYTHING AGAIN to the new person. They finally say I can cancel.