Vodacom bad services and contract agreements

My is Tshepiso, I have two contract with Vodacom, one for data and the other it’s a phone contract. The phone contract is has been due for cancellation or upgrade since 2020 November. Ever since October 2020 I’ve been calling to cancel the contract but they keep billing me for the contract that has been due. Every time I call they keep promising to send reference number through sms but they don’t send them. Some consultants they even pushing hard for me to take another contracts which I don’t want to take. I repeatedly called again today and the one agent was rude on the phone her name is Mpho. Mpho was trying Force me to enter into an upgrade contract, for 15 minutes I had been on a calling denying and she finally dropped the phone on my ear since I was refusing. Vodacom is not practicing business in an ethical manner because they can’t let go of finished contract between them and customers. Their service is substandard, moreover for the magnitude of their business this is indeed appalling.