Bad Customer Service

Good day on November 2020 I did a premature cancelation with vodacom on 3 of my lines they send me the premature cancelation quote on the 3 lines I whanted to cancel 3 days later I went to the vodacom store in West Gate Mall I made the payment on all 3 lines and the guys at the vodacom store has send it true to the cancelation department and I did the same from my side now they send me a bill for December and they are charged me again for a premature cancelation on 1 of the numbers I paid up in November I have phone vodacom how many times regarding this and I have send how many e mails to them but still no answer and no feedback from them all you get from vodacom is bad customer service.