VERY POOR CUSTOMER SERVICE

After making a general query to vodacom on the 9th January I found from he voice machine that I have upgraded my contracted which shocked me as I took up the contract in February 2013 and was intending to cancel now Ferbruary 2015. I have made more than 10 calls concerning this and everytime I was promised someone will get back to me and that never happened until I spoke to one person with better service who advised me to send a letter and afidavit which i did on the 22nd January but till then I heard nothing but a debit order for that upgrade went of and i got a statement for that upgrade instead. I made a follow up call today and was put from pillar to post everyone telling me there is nothing refecting on my account that I sent these documents and at one time one lady dropped the phone on my ear. I eventually spoke to a guy in retention department who picked it up and said it was still under investigation but did not know how long it will take, he had a nerve to ask me how is it possible for someone to upgrade without my knowledge because they need my documents. I am currently waiting for the feedback and I am dissapointed on the service I want this contract cancelled ASAP.