Disappointing service

1.On 5.07.2022, I sent an email to *** requesting a cancellation of my contract as it was due to expire in August. There was no acknowledgement of my mail nor have I been called. Fast forward to September, my contract is still not cancelled and I have been billed for September. 2. In May 2022, I started realizing that my data is depleting quickly. As per my contract, I'm allocated 3GB monthly, but it gets depleted within a week and I still have to load my own data , and that will also deplete in days. On 05.09.2022, I called Vodacom twice , having to hold on for over 30 minutes for my query to be resolved and still the lines gets cut off. No one bothers to contact you back despite having all your details :( Please resolve my queries urgently