Extremely poor customer service

Hi All I am extremely unsatisfied with Vodacom service at this point of time. I called to cancel my data contract *** on the 26 February 2021. Just to find out the following month my request was not honored when I called them again to confirm they said they will investigate and credit me. I am still waiting for feedback. However they keep on harassing me from payment and have to explain my situation 10 time and no feedback. I called again yesterday after I received another call for payment, just then to get an explanation that my contract cant be cancel yet as I am on a 36 month contract how insane is this after Vodacom confirmed that my contract has been canceled and will be credited. WOW which one is now does Vodacom even know what they doing or how to read there own systems. Please help me resolve this urgently.