Incomplete Payment Details

This people use you to do their job and when they have to pay you they send you incomplete payment details, I did 2 drink diaries for 2 consecutive months and when I redeemed my incentive they sent me a Standard Bank LTD Instant Money Voucher without a PIN when I call standard Bank they say they can't access the reset option for Instant Miney Vouchers sent by MDI Africa on their site, but they can help you only if you need a voucher, of which I find confusing because they checked and saw that I had money in my Standard Bank Instant Money Pocket/Account but still they can't help me, it's been almost 2 weeks with me trying to contact MDI Global, I texted on both the app. customer service, I sent countless emails and even called the number they out on their website but when you call that number a machine takes your call and tells you to leave your contact details and full names and they will call you back but even today I called again and I have never even once received feedback