DSTV ARE DAYLIGHT ******S

I am so angry with DSTV. They sold me a lie when they sold me a streamer. I want to cancel but they are refusing. Their website says I can cancel before 7 days passes if I am not happy with the product. I received on Monday and 7 days hasn't passed and they are already running from pillar to post and they want me to pay R400 cancelation fee. THIS IS DAY LIGHT *******!!! I just spoke to one of their agents Thembeka who refused for me to speak to her supervisor/manager. She told me that they are in a meeting. I want the proof that they are actually in a meeting. Also she hung up on me and refused to transfer me to an agent who will assist me.