Tips to catch a bus from delhi to anywhere

So i booked my delhi to manali bus ticket online. Got the travel agencies name(Raj Himachal tours) and also where do i need to catch the bus. My bus was at 5.00pm so i started calling the number I had at 3.00 pm. No one answers for an hour... Somewhere around 4.00 i am told to stand exactly where i am standing, a bus will come and pick u up(majic) no bus number nothing at all...(Actually i heard 9100 in the background).

So here i am waiting for a bus 9100 and that has raj tours on it...
At around 5.15 there is bus (Mukul travel, 1777)... It cant be mine.. waiting for 10 mins I call the number again.

Me: Manali 5.00 pm
He: 1777
Me:WTF

Once I get in the bus I have a seat 16 but am sent to a seat really behind...
The adventure of catching a bus does not end here... Even if you are sitting on your very own seat that you have paid for waiting for the bus to leave the bus dude can ask you to get down if an odd number of people need to be seated... So I was lucky there was me an another guy from south india travelling alone(From the looks of him i guessed). There a gang of 4 people enter with only 3 seats left... The south Indian guy is moved out... God know why????
Lucky me...
Until next time...