Airtime frustration

I was contacted ahead of the launch for this app asking whether I would be interested in this. As we stay on a farm and my 45 workers are always in need of airtime it was the perfect solution. I got hold of the printer and got the app from Play store but then the frustration began. You pay R1000 into a bank account and then as you request airtime it gets deducted from your account. Sometimes the amount would go off but no voucher gets issued but mostly when I request a voucher it tells me R*100*01*null# and I have to tell my customer sorry cannot help you. I have complained to no avail. On the Play store the testimonials are from the creators themselves. Their Facebook page is just as useless when I phone the numbers on their website I get no answer or the phones are off. I have sent numerous emails without any answer. This could potentially be such a great idea but leaves me only frustrated. Please look into the company for me as the owners are very illusive. I have R99.18 credit I can do nothing with. Thank you