On Air TV

They contacted me to replace my old decoder, The decoder is far to expensive and I raised it as such. I agreed in the end to replace my old decoder that gives me trouble. I have insurance on the old decoder but the onair lady said i do not have. DSTV phone me 2 days after I connected new decode requesting why i did not replace the faulty decoder because i have insurance. none of my e-mails before acquisition and after are answered. now they want a cancellation fee of r400.