Bharat Pe — Money not refunded for cancelled machine

I see the ad of bharat pe 0% fee on swiping and I have very small shop in society. So I thought to apply for machine and filled the details what asked after that payment page opened and they asking 5000 pay which was returnable so I ok with that and pay the amount which should be the last option but after payment one another page open for kyc and asking for gst number etc which I don't have. I called customer care same day and told everything and cancelled my machine and he promised to machine will be cancelled and money refunded within 3 to 4 days. But till today I called approx 5 times in customer care and they told only one thing that you will receive a call for cancellation with 24 hrs but I didn't receive any call from their customer care yet.