Clarks India — difference in discount percentage online and in store

I bought a pair of boots at 25%off from Clarks store in MGF Metropolis yesterday.when I came back, I was checking boots online on clarks.in and to my surprise found it available at 40%off. When I went back today esp and told the store manager about this, he checked the price by calling up someone and agreed it is at 40%off.he said maybe there was some problem in his system, that's why it showed only 25%off. I asked him to adjust the balance in that case by either returning me the balance or giving me a credit note as I was no where at fault and why am I supposed to pay extra because the store's system was not showing the right discount. But he refused to do so.he told me buy something for that amount.I looked around but dint like anything..He then convinced me to take shoe polishes for that much amt.I had already bought the Polish I needed yesterday.he made me take those forcibly and I had to pay rs100 extra as there was nothing equivalent to my balance amt Rs 1050. He told me to come back later even after 6 months and exchange them for any shoe I like.I asked him to give me a receipt for the same as I would need it for exchange. He refused to do that too. I had to leave for my hometown early.and I had already wasted abou an hour at that store.so I had to accept what hhe said as I couldn't hav delayed more.but this is the last thing I cud hav accepted from a brand like clarks...deceiving customers firstly and then rude managers.