Not cancelling my contract

Due to the terrible connection quality of my Telkom Mobile connection I decided to cancel my contract.<br> I got into contact with a consultant who mailed me a cancellation form and instructed me to mail the it to [Email Removed] The footer of the form also gave the address of [Email Removed] I sent the letter to both addresses on 30/06/2015. <br> <br> Within minutes I got an automated reply from [Email Removed] with the message \Thank you for contacting Retentions at Telkom Mobile. One of our Agents will get in touch with you and provide you with a reference number."<br> <br> Having heard nothing by the 6th of July I started an online chat and was assisted by Michelle who said: \""They will come back to you"