Big Bazaar — request not fullfilled

I visited the Big bazaar in mysore, there was a exchange offer, I wanted my cot to be exchanged, they asked me to give my address, the people would attend. But no one has come, I called to the shop, they say "today they will come, ur request is on, we will come". Its one week, when they come, exchange the cot, the offer will be not available. what is the use? The company should see that the customer requests are fullfilled in time.