waterproof phone not waterproof

So 17 March I wrote my first report on this phone and promises has been made but nothing has been done. The day I wrote my report Vodacom called me asked for my job number and told me that Head office will take it from there. I have heard nothing from them. I went to the Vodacom shop about 2 weeks later and they told me that Head Office will call me in the next 24h I'm still waiting for that call and when I went back to the shop my phone was lying there, no one does anything with it and I'm now done with it. Why should I pay for a broken phone every month? If head office calls me today I wont be nice this time I don't want to hear how they are willing to help me because I know they wont help me. I want to cancel my account with Vodacom. Its all smiles and service until you have a contract with them, after that there will no longer be good service. My friend even went to claim her free screen after it broke and they told her there is no such thing.