Poor service from Vodacom

I am a vodacom customer for the last + - 12 months. I took out a contract where I was getting a extra device free but for the last 2 months I have been debited for this 2nd phone which was supposed to be free. After multiple store visits and calling customer care, accounts and many other departments all I was told is that a case has been logged and that it would be seen to. This is the case everytime I call or visit a store but everytime the next person tells me that the previous person never logged any case. The service is poor in store and call center they have this attitude that they don't want to help me and in every vodacom store that I have Walked into all over Cape Town I recieved the same treatment from vodacom consultants I think they should get some tips from cellucity as they have been more helpful in 10mins than the last 2 months with Vodacom back and forth I have had enough and i want pay whatever I owe them to cancel my contracts as over charging me for extra services is a breach of contract but they still expect me to pay a cancelation fee. Thanks for the worst experience of my life Vodacom