I want them to cancel their contract with me

On the 29bof August 2023 I got a call from on air they told me about their offer they have for me of showman,Netflix and dstv channels for 2 years and it will cost R179 but for the first month I must payR239 I tell them that I like the offer but the problem is that I dnt have a smart TV they said dnt worry it will work even if it's not smart tv ,when they deliver the decoder I ask the driver to install it for me he said he can't install it because my tv it's not a smart tv I told the driver to take it back and he said he can't take it back he's just a massenger I tried to call on air when they answered the phone they told me that they will transferred the call to the right department but they didn't come back to me than I decide to wait until they make a debit order after I reverse they money they start calling me it's when I tell them my problem but they said they can't help me because it's more than 7 days already so please help me I can't pay for what I didn't use