Vodacom contract

I have a data contract with vodacom which is supposed to end on march 2025, I've been trying to cancel the contract since Fen this year but im not succeeding I've even paid the cancelation fee that they told me to pay but still the contract is still active. I've been calling them for the past three months and everyone they they me the cancelation has been loaded and that i will receive the email and sms but till now nothing.Hello Peter please assist.