Duracell charger wont charge..

I bought this item less than a month ago and only used it once... the second time when i try to charge my AA and AAA batteries, it didnt work, no light nothing.. i then got fed up and tried a different wayto get it to work though i know it wont charge anways, instead of positive to positive and negative to negative, it put the batteries the oppositve way. e.g positive as negative and negative as positive and the red light began to blink.. what does this mean? and will it charge? i need help?? i got my money refunded by the way but i rather try and get it fixed than throw it away ? lol