Incompetence after I cancelled contracts

On 7 April 2025 10:30am I phoned Vodacom and have spoken to Edith. I had 3 active lines of which I cancelled 2 lines and upgraded 1. My last payment was then on 7 May 2025 for the 2 cancelled contracts. On 7 June 2025 another payment was deducted again for my cancelled contracts. I went to the Vodacom at Greystone Rustenburg. Mpho at the shop told me to pay for another 2 months again as they did not receive the cancellation. I refuse to do this as my contracts was finished and cancelled. Please sort this out!