Very poor service from Vodacom

One of the worst experiences I have had. Requested an upgrade but received a package that I did not request. Tried to have it corrected by speaking to more than 10 agents who all promised to help but have not. No Manger took my call or called back. Now being told that I cannot cancel my contract. This is ridiculous as they made the mistake and are not willing or unable to correct it. I am now stuck for a product I did not request nor need. Absolutely disgusting service from Vodacom.