Vodacom Policies to be frowned upon

I signed up for a funeral plan with Vodacom in March 2023 but soon realised that I couldn't afford it. I tried since 2 May to cancel but to no avail. I've called dozens of times and get the same generic answers from the call center operators. I've sent my Vodacom Invoices as requested but still no responce. I'm so disappointed in this company. I don't know what else to do