Vodacom don't appreciate

I'm upset with vodacom I open a contract in springs Mall and I told them that I don't want an open contract and the guy who assisted me he agreed but now I'm stuck with a bill that I can't even pay every time I call vodacom they keep on promising to log the complain nd resolve it but even now no feedback from vodacom they even close my line today. I have 4contracts with vodacom but it looks like they don't appreciate their customers.