Price Lock Increased How?

If you on price lock 2 year contract and you in your second year not done yet when you see that your dstv premium keeps on increasing? Am i not suppose to stay on my original contract price of R899 until the end of my contract? Because im sitting here doing my bills and going through everything only to discover that my dstv price lock has gone up to R979.00. I am furious because again im on a 2 year price lock contract. How can dstv rob a person. If i did not look through my statements now i would never have seen that it increased. I want someone to call me back asap and correct this now please.