Pooja Travels — ac not working from starting point

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Its about ac

Its a ac bus. And from starting ac is not working they have charged extra for ac and now after an hour they are saying the hisse pipe is broken
I am not interested to travel in this bus as i am a heart paitient i had a bypass six months ago
The driver is not ready to pay my amount back
What should i do i have attached photo of my boarding pass kindly look into yhe matter and do the needful as early as possible or send my refund