Vodacom is realy ridiculous.

I had a 24 months contract with Vodacom wich was ending on 30/10/2018.at the last dat of my contract i was contacted by Vodacom callcenter agent offering a new contract wich I accepted the deal and the package was sent to me,i received the package but the device was faulty and I contact Vodacom and they arranged a corrier to collect my phone,i then contacted Vodacom to Cancell the contract and I was promised that it is cancelled,but now am getting emails from attorneys collecting on behalf of Vodacom,i really dnt understand why must i pay for services i did not receive.i also went to Vodacomshop at rustenburg asking for assistance but it was useless,they said can't assist me because I did not apply for the contract with them.now Vodacom claim i owe then R1551 for a device that was faulty and returned to them