Extremely pour service all around

I have given Vodacom notice to cancel the data contract on 30 April 2020 telephonically. The operator informed me that this will be done and that I will pay the last premium for this contract at the end of May 2020. Today Vodacom contact me for an upgrade on the same contract and inform me that it has not been cancelled. When I asked her to cancel with effect from my original request, and I must admit I was extremely irate, she told me that she cannot assist and that I should contact Vodacom myself. I told her that she is Vodacom and she dropped the phone in my ear. Vodacom you better fix this now. FYI I had 4 contracts with you, of which one was to be cancelled. If this is the service I receive, you better know I will cancel ALL. YOU better contact ME