Terrible service

I had taken a contact out with Vodacom over two years ago. Contract was signed for two years. My contract expired on the 13 March 2020, I was called in December 2019 for an upgrade and I said no, I will be cancelling my contract once it is done. I was called in January, February 2020 for an upgrade and I advised the same. In March 2020 when a consultant called me, I told them once again that I am going to cancel the contract and the helpful gentlemen advised me that he will send the request and I should not worry, they will bill me for March and it will be my last payment. April 2020, May 2020, I was billed, I have tried calling Vodacom on 135 and *** but no one ever answers the call, I hold for more then two hours with no answer. I went into a Vodacom store early June 2020 and they advised they can not help me I must email : ***, so I emailed them and the email was undelivered. I went back to the vodacom store and they said that is the only email they have and the numbers that I should call is 135 or *** which I did state that no one answers. During the situation the country is experiencing now, cash flow is hard on majority of the country and Vodacom doesn't seem to care. All I am wanting to do, is to cancel my contract, is that so hard??????