Cleartrip — cash back and charged more after showing a different price

Dear Customer,
As per your telephonic discussion with our Executive we regret to inform you that for the booking Bahrain - New Delhi return (Trip ID: [protected]) as you have entered the coupon code but yet the cashback is not given we have escalated the case to the concern team we request you to wait for 48 hrs as soon as we get a updated we will let you know the case id raised is 06015489.
We apologize for the inconvenience caused.
For further assistance, please write to us at [protected]@cleartrip.
Thank you for choosing Cleartrip.
Regards,
Cleartrip customer Care
www.cleartrip.com

The above mail from them is dated 28th May 2018 and till date no response. Now when I called them today they are saying no price change and the prices got escalated after I pressed the pay button. They charged me additional USD 100. Good way to dupe the customer and make money. Show a different price and charge something else. On top of it the customer care is pathetic they don't respond. Their 24-48 Hours are months.