MCent — frequent change 50% to 25%

When install mcent browser they were giving 50 percent discount for first recharge but when i completed my recharge points and try to recharge u change 50 percent discount to only 25 percent so that i have make another 48 thousand points more for my recharge so, now i'm filling completed cheated from this app. I have put a camplain before giving negative review on google play store hope u will going solve my problem so, that give positive review on play store.