Customer service non existent

We cancelled our contract on the 30th of April. We called in and they told us to pay the cancellation fee at the store. Which we did. They then said to call them back the next day. They asked for an invoice which the store did not provide us with. We have now been calling for 30 days to get an invoice emailed. I am cancelling ALL my contracts with Vodacom immediately. Tired of there useless service and outrageous prices.