Household Bank I have a Household Platium and HSBC account different names same affiliations for 7 years paid on time increases in credit limits however, HSBC is 14% and HH is 26% Ive tried to the interested lowered interest rate rip off Internet

I have a Household Platium and HSBC account different names same affiliations for 7 years paid on time increases in credit limits however, HSBC is 14% and HH is 26% Ive tried to the interested lowered on the HH and their CSR in India give me the run around to different telephone numbers.  They say its Household banks best rate.  I have paid on time, paid above the minimum payment required and have had credit line increases. Thats what the interest rates to consumers are based on. 

How is it I get 14% on one card and 26% on the other from the same company to same consumer / customer?  Is there remedy to banks ripping off customers?