Consumer Redressal

I have purchased some goods from big bazar kolkata-700013 today at 7.30 . After coming to home i noticed that billed has been overcharged for 3 items of 13 item taken . CleanMAte Toilet cleaner 2qty offer price 52/- actually charge 72/- difference rs40/- itc yippe noddle 1qty mrp 10 actually charged 12/- difference 2/- When i called the store in there local no. they told me to come with the goods and bills . The problem is that for the mistake of big bazar billing department for 3 item of 13 item i have to carry it and then they will provide me billing reversal. My home is 15 km from the Store outlet and just for rs45 over billed i have to spend 50rs for coming and going again to outlet. After that i called the helpline desk at 18002002255 today which didnt even gave a complain no. even 35 min of talk and they finally disconnected. Does a complain require 35 min to get registered??? And even then i dint got the complain no.