4 days for excitel is stupid. the entire local network is managed by local guys. if there is a wire cut, it can be fixed in a few hours during day time. backend problems are another issue and even they are not going to last for more than a few hours. since i do not use airtel as primary, i do not really notice if it ever goes down. but i think their system is pretty good at identifying problems on its own and you usually do not even need to file any complaint. with excitel, you might get lucky if there is another guy on your cable route who is actively using the internet through the day so any complaints while you are not online probably gets reported by him and get resolved faster.