Redbus — Bus did not arrive at bus station

I booked a bus from redbus that run by pepsu that went to Chandigarh from delhi isbt. It was to depart at 11 am in the morning. I arrived at isbt at 10 am. I waited for the bus. The bus did not arrive at 11. I asked on the counter that whether the bus is late or not. So they told me the bus won't arrive. I talked to the pepsu helpline and they told me that the bus was not available from the past one week. I don't know why the redbus app let me book a non functional bus on first hand. Then i raised a complaint to refund my amount. They told me you will get a refund within 14 working days from the date of complaint which was 2nd April. I tried contacting them again after 14 working days. They told me to wait another 48 hours. I have still not received my refund of amount 707 INR.