No support and poor communication

On Wednesday evening I made my first purchase off the Zando site. I was notified of a R200 coupon that I could use and decided to try and use it to get something for my girlfriend. I picked items to the value of R200 and app**** the voucher. I followed the prompts for payment with my Absa credit card. A screen eventually opened, prompting me to enter my one time password (SMSd to me). I did so. I hit the Submit button to pay. Nothing happened. It became very clear that the site had broken and that there was no way for me to proceed. I eventually had to close the window, return to my payment options on the site and fill in my credit card details for a second time. This time the payment worked (I didn't do anything differently). Except, this time it had removed my R200 voucher and made me pay the full amount R247. I emailed Zando and gave them all the details they needed. No response. I looked on their site and found they were hit by loadshedding. I waited a day until they were back up. Still nothing. Their Facebook admin said they had already emailed me. That was after hounding them. And I still have nothing. I've tried everything to be able to speak with someone. I give up.