Want to cancel. Tired of them

I have been having issues with the call centre for the last few months. I have been running out of data, and every time I want to purchase a bundle there is a issue. My account keeps on getting get soft blocked and I am 8 months pregnant living alone so I can't afford for that to happen. Once I phoned the system was off and my phone could only be unblocked 4 hours later! The bundles I buy over 111 says it's successful but never gets activated. So I have to call the call centre every time. They have the worst attitudes. I am so sick of repeating the security questions! This morning I called to activate a bundle and she tells me my account is in arrears. My debit order date is the 28th so it's suppose to go off today. And they say it's a public holiday so I am in arrears. I am sick of all of them. Once every sixth time you call you get someone knowledgeable but I can't handle the rest anymore. Someone actually told me the other day that I should switch on my background refreshing on my iPhone to save data?? Everyone knows that eats data! I want to cancel. I'm done with vodacom and this pathetic service. I am a calm person but found my self screaming at the last call centre person.