Poor service, now unable to cancel a contract

I lost my phone and wanted to pay for an early renewal of my contract, but could not get anyone to generate a quote for me. I tried the call centre three times on 30 November. On 2 December I went to two stores, then vodaworld where after three hours and four conversations I still did not have a quote. At that point I decided to cancel my contract. I asked the manager to get a quote for me and he promised to do so. On 7 December I called the retentions desk but they couldn't help me because I was on \customer 3d"";Thabo Maphalala and James Dlangamandla three times) but my contract still has not been cancelled. This is the worst service I have ever experienced and I have wasted a great deal of my time. """