Junk Refund Processes

<p>After several attempts to get Vodacom to pay me a refund for money that they paid into a wrong account, each time I call them they ask me to send same documents. I have been trying to get my refund since 25 June and till today they do not have records of my request besides me showing and telling that I have been sending Proof of Payment and Proof of Banking details as per their instructions. Over and above this, since Wednesday I am getting Credit Limit reached notifications and they're locking me phone services meaning I have to call them every evening for unlocking!!! Is there a way to terminate a contract if dissatisfied with a service? I can't tolerate this junk service anymore. NXA!!!</p>