New client - impossible cancellation within 7 day cool off period. Management please call me.

Telkom is driving me nuts. I am a NEW client, I ordered a contract phone and data bundle, the phone arrived and is very slow, the camera does not work properly and I am very unhappy with the phone. I phoned within the 7 day cancellation period and spoke to Shanice Derby, who said I had to KEEP the phone for the full 7 WORKING DAYS and phone back on the 8th day. I told her this is not how cooling off periods work. We argued back and forth and she was adamant that I had to keep the phone for at least 7 working days. This phone call is recorded. I phoned back on the 8th working day to be told that the contract was outside the 7 working days but that they would escalate it and phone me back. No one has gotten back to me. I have been passed from pillar to post today and have spoken to about 5 different consultants, none of which would help me and just passed me on. I want to cancel the contract.