Tsrtc - Worst service given

Actually, we were (couple with a *-year kid) returning from Srisailam we get into TSRTC Vajra bus which cast was *** per ticket on early morning *.** am. At that time the driver didn't mention that the bus is under repair. He simply took the money and gave a ticket but actually the bus is under repair from before night itself. The bus started from Srisailam and after the *hr journey, he suddenly stopped and he asked us to get down from the bus and asked to get into the ordinary bus which costs less than ***/- per ticket. Which causes very inconvenience to us and when asked about to refund they said their no way to refund money in a rude way. If he mentioned before itself we could change the bus but he didn't tell us. Kindly go through the issue and do needful to us.
I'm attaching ticket message which we took at the time of journey and express bus journey photo and driver written slip about bus problem.