Flipkart — Change not given

Have ordered for Groceries. My order no being OD[protected].I had to pay ₹400 for the order. I did not have change.so I paid ₹500. The executive who came to deliver had only ₹50. The balance ₹50 she said she would come back in the evening & give but till today she has not given me the money. I called up Flipkart several times. But they are ony postponing the dates for resolution. Some of the telephone executives are also behaving nasty at times. One put my phone on hold but didn't come back later and one executive called up but didn't even wait for a second either. The call was disconnected the moment it rang and they are sending me SMS that I was not available. Earier also for one grocery order they did not have change. The executive threatened me to cancel the order but he spoke to his senior and they accepted ₹24 less. The order value was ₹424. The took 400. Even if they adjust that payment now I have to get ₹26 back. I believed Flipkart & gave the money but this is the way they are behaving.