I want my order cancelled or else

<p>I was contacted by on air tv for a offer to trade in my dual view decoder for a new explora and a extra view decoder. I accepted the offer and the goods were delivered last week. I was promised after delivery installation would be arranged 48 hours later and a sms will be sent with the installers details. This was sent and the installer did not answer his phone. Eventually i sent a text message and the installer rep**** saying he only opens on the 9th January . I then called on air tv back informing them about this and told them if they dont sort this now i want this offer cancelled and they can have their sealed goods back. I was told they will get a new installer and a sms will be sent to me within 24hours . From then 6 days have passed and still no one has contacted me and no sms . Im trying to call again today the 29th December and no one answers the phone and after a while the call just cuts. If i receive no feedback from them I will be taking legal action . </p> <p>To others out there dont take up their offer as you will regret it.</p>