My experience with sulekha.com on ad posted(paid & free), you will get response immediately, but once starts calling that No, the mob will be permanently switched off. Just to create a response for the Ads, it appears they themselves do such trick. When weekly / fortnightly / monthly summary is send, they boost many responses to their ad portal, but in reality, the effectiveness is a big zero. Their portal is ok for a free listing, but not for a paid / premium listing. It is a waste of money.