Not Accomadating at all

In the first week of April I bought jars for the amount of R12.99 each, 2 days later I went back to spar to buy 10 more. The price increased. I asked the owner to accommodate me and would like to have it for R12.99 as I already bought 12 and will be buying 10 more that day and would like to order more as I have allready bought all the jars off the shelf he said NO and I thought that he would be more accommodating. I do realize that prices can increase at any time, but I was there 2 days before and not a month later. Sad when they think of their pockets first and not us . We are the ones filling their pockets may be it be by R5 or R12.99