I have recently got my SBI CB CC with only 20000 credit limit. So I am refilling the card and using it again and again . Will I be eligible for cash back with this method. Secondly I also have a doctor's SBI credit card with 130,000 limit which I am not using is it possible to transfer the limit to my cash back card. Thirdly as I am completely using the 20000 limit will it effect my CIBIL score ?