Total lack of service

I have various complaints about Vodacoms total lack of customer service. I have tried 4 times today to contact the upgrades call centre supervisor and after being put on hold for 5 minutes I get cut off. I ordered 2 upgrades last week, eventually after a dozen calls I received a delivery today, with only 1 phone! I also specifically asked for a sim card yet there was nothing in the box except 1 phone. Where is my second upgrade? I did them together, you would think they would arrive together! I also cancelled a contract in March - gave 2 months notice before the contract was up yet still, in September, I am being billed for this contract that I cancelled? Your call centre agents are useless and do not know how to do their jobs. Why should I have to deal with a company that employs *********** people? I need a resolution to my queries. I have been with Vodacom for 20 years and in the past few months they have managed to undo 20 years of good service.