Price Lock just a ****. Still paying full price

I was contacted by DSTV in November 2018 and offered the explora on the price lock package. Accepted and had installed in December 2018, however, I am being billed the full amount since. Despite numerous calls to the call centre, promises that we will rectify and you will receive an sms with credit, no change. Ten months later and still paying the full price. Seems that the price lock offer is just a **** to get people to sign a 24 month contract.