Parveen Travels — extremely pathetic service

Booked bus ticket in parveen travels from chennai to calicut in its non-ac semi sleeper.
Bus (40 seats) started from koyambedu 2 hours late - tech problem.
Reached chengelpettu toll booth 3.5hrs late.
Again suffered tech problem.
Replacement bus (Which doesn't have kerala permit) came but with lesser seats (36 seats).
4 people to coimbatore were left there and started.
Bus took a u-turn after 30 min, to onboard the stranded passengers.
Another replacement bus having kerala permit came at kallakurichi, again with 36 seats only.
Offered a cab for the standing passengers to coimbatore at salem, but was not arranged.
After all, the bus reached calicut at 5pm, late by 9 hours!
The worst ever bus journey i experienced so far.