Telkom Cancellation Systems Is Bad News

I had a Telkom contract from November 2017 that was a 24 months contract. After the contract was about to end i sent multiple cancellation(s) request via their Telkom App. All the cancellation had reference numbers and i also received a call from Telkom agent to confirm the cancellation. Even go the confirmation email for the cancellation of service(s). But it was never cancelled until i had to change the network provider. Years went by and now they're coming with the story of never received those request( i still have proof of all information provided). Another story is that there is an outstanding amount that i must pay yet all the sim card(s) network was stopped in July 2021 but on their statements it's showing it was working until December 2021.