No warrentee, no contract, yet I must keep paying.

I signed a contract for a phone last year in March 2022. The phone stopped working in February 2023. It should still be under warranty. Samsung's support staff said they will repair the phone for free if I Telkom will provide them a proof of the contract. However, Telkom's *********** staff are unable to find my contract on their system. Yet I am being charged for this contract and for a phone that is not working.