Disappointed with discovery insure rewards program

I joined discovery insure 12 months ago, even though your quote was slightly higher than comparative competitors to insure my vehicle for business use with house hold contents cover.this was based on the selling point of your cash back rewards system. at first until recently due to the amendments to your cash back program, I was rewarded fairly through this incentive, still half of what was claimed by your program which I suspect is un-attainable.now recently amendments have been made where I receive less than 20% of what I was originally receiving, if you claim your customers are rewarded for good driving behavior with discovery, you create an expectation and clients strive to achieve these rewards, this reduces the risk profile for discovery.i have after inquiring about this, was informed I'm being penalized due to the milage. this is unacceptable, my vehicle is insured for business use and im already paying a premium for this reason, now to further penalize my score due to milage is nothing short of being disingenuous and false advertising. I will most certainly cancel my policy with discovery as I don't feel I will receive honest support when I need it the most from discovery insure.