Double billed for almost 24 months!!! Pricelock!!

I have been trying for more than a year to get DSTV Pricelock to call me back and resolve my double billing issue. When they wanted to sell me the pricelock, they called a couple of times every single day until they got us into agreement. After service is POOR! For more than a year i have been battling to get someone to call me. Everyone keeps ons escalating but no one phones. This year June, it will be 2 years that i have been double billed for 1x pricelock requested. How do you bill one customer that asked for 1 pricelock, 2 pricelocks for almost 24 months?? Pathetic.