Vodacom is *****ing my money

On 2021/08/07 I phoned *** and asked Vodacom to change three of my phone numbers (all three contracts already expired) to pre-paid. They said they will do it, but they did not do it. Since then I have phoned them about once every month to ask them to change it to pre-paid. They said they will change it but they did not. On 2021/05/10 they said they will change it to pre-paid and give me a refund. On 2021/06/25 I phoned them again because they still did not do it. They instead insisted on offering an alternative cheaper contract for al three phones. I agreed on the condition that I can cancel it within 14 days cool down period and keep to my original request to change it to prepaid. On 2021/07/08, within the cool-down period, I phoned them to cancel the proposed upgrades and keep to the original request to change the numbers to prepaid. Now I have a lot of difficulties to get them to do that. That is ********.