DSTV false advertising promotions

DSTV offered me a reconnection of my compact susprcription fee of R339pm for 3 months via a link, I paid and it showed me a bigger amount that the R339, I paid R402 thinking that for the next 3 months I will be paying R339, |I now am paying and it is asking me for R470. I called the call centre and they say the offer had expired yet the offer expired on the 31st of July and I made my payment on the 23rd of July which their consultant confirmed. I wan to cancel all my families suspritions and get Netflix as we are being ****med and treated unfairley