ICICI Bank Credit Card — Short credit of Reward points

i had applied for credit card in ICICI bank and they gave me Big Bazaar card saying that what ever i purhcase in big bazaar i will get 6 reward points for every repuees hundred puchased. so for every thing i purchase from BIg Bazaar i use to swipe ICICI card to get more reward points. But in september on purchase worth Rs. 2000 ICICI my reward points where short by 100 points when mailed the complaint the reply i got is Big bazaar people has swiped my card at wrong machine and so i will not get the reward points. my question is ICICI has not cleared me this condition earlier and it is not my concern that on which machine they swipe my card. my concern is to purhcase from big bazaar and my transcation details also show that i had used my card in Big bazaar then ICICI bank should giive me my reward point which they have not done. now this is a cheating done by ICICI bank and i think this people are playing with the money of ours.
Now i have decided not use ICICI bank card in future and suggest other the same because this people does not entertain your query if they are in default.