bad service at vodacom

I am really not happy with the service from the people that work with upgrades!! I have a contract with vodacom pay R557 per month and now its time for an upgrade, but due to 2 or 3 late payments last year its been decline........to upgrade to get a galaxy note 5...... Why should i then continue using this network and contract??????? I was late not even behind with payments!!!!!!!! Would like someone to call me back and explain this to me!!!