On Air ****

I have sent an email to on air asking them to cancel the contact for the decoder I took from them ,reseon is that I couldn't not use it ,I never used it even once and I sent an email telling them that I don't afford it that was another reseon ,when I call them their line is busy *** ,and they are messing up my credit score ,what they are doing is evil .becouse it's like they are ****ming people ,they don't respond to their Whatsup either ,plz I need help with this