Tamil Nadu State Transport Corporation [TNSTC] — 18k buses are not coming on time

In the afternoon around 2-3 ill be waiting in nandhanam bus stop to return to my home in west saidapet so i have to wait for 18k buses.
But in that time i have to wait for more than 45 mins to ger the bus.
Just before reaching the bus stop three buses go jointly and after that none will come. And again mostly three buses will come jointly.
Either the buses are not coming on time or the two to three buses comes same time.

That is the main reason that buses are not coming on time.