Vodacom listing me as a non-payer despite contract terminated

I cancelled my contract with Vodacom a few months back when the agreement expired. I stil do not have a paid up/ cancellation letter despite following up with the entity. This is affecting my credit profile as it is reflecting as an overdue account despite the contract being terminated and the number being converted to contract. Please send me the cancellation letter. I will the credit bureau information myself since Vodacom couldn’t be bothered with updating my details