Getmecab — trip cancelled by getmecab but advance payment not refunded.

Address:

Pune, Maharashtra, 411061

I had booked a cab on 12th may 2018, also paid the advance amount of 300 through paytm. Order no - inpun[protected]
After some time they cancelled the booking as the required cab was not available. I have attached the screenshot of messages, which mentions the booking confirmation & cancelling.
But still i didn't get 300 refund. I tried by calling many times on [protected], but every time they said we will check and refund. But i didn't receive any callback or refund.
My registered mobile number is [protected].