Never sent my voucher, which I paid for

Hyperli promoted a hair & beauty salon with their specials on their app. I purchased a voucher 3 weeks ago from Hyperli, the money was deducted from my account. After contacting the salon to ask when I can make my booking for my treatment, they asked me for the voucher number, I advised them that I had not received a voucher number from Hyperli. I then immediately emailed their customer service and asked when I will be receiving my voucher as it had been paid for days ago. Till this day, Hyperli never had the decency to contact me back or respond. I have been bluntly ignores. I feel I have been ****** and now shoved away. This was the first time I used this App and I must say, what a bad experience.