Complaint lodged regarding invalid contract

Good day. On 28 March 2014, I went to Vodacom 4U in Vaal mall for an upgrade and concluded a contract, the phone only functioned well until the 2nd of April 2014, I took it back for replacement and the manager refused. I subsequently wrote a letter to the Manager cancelling the contract and he blatantly refuse to take a letter, the I decided to phone the Vodacom call center and was advised to email the letter to customer care, I emailed the letter to both the manager and customer care on the 4th of April 2014. I made several attempts to customer care and they were of no assistance, and there were also emails between myself and the Manager where I was clear that I cancelled the contract and I referred him to the consumers Act that states the 14 days return allowance, and he was adamant that the contract is valid. To cut the long story short, I found out last month(April 2015) that the debit order for that invalid contract was added to another contract. I followed up with the call centre and was asked email my correspondence. No one came back to me and I have been paying for invalid contract for more than a year. I requested the bank to reverse the DO today. I need to be refunded.<br>