Discovery Points and balance of cash back

Good day, every time I go onto [URL Removed] and look at my clubcard cash rewards balance it changes, last week it was +- R90 today its R17, how can it change, and I sent emails to clicks on the 18th & 23rd February 2015 asking them where is my Discovery Bonus points and why is my balance changing without any response from them. Please see if you can assist me. My normal cash backs are over R200 per cash back cycle because of the Discovery bonus points, tell them at this rate with all the issues with Clicks club card I am going to start buying my stuff from Dischem. Thanks