Terrible customer service and pampers Air channels

My husband bought the pampers Air channels diapers because he couldn't find the premium diapers. The worst mistake he made. He bought the box that usually last over a month when we buy the premium. I complained to pampers about the leaking nappie that breaks with the elastic being visible and they suggested their couriers will come collect 10 of my diapers and they will send a R220 voucher. Eventually their customer service phoned and I agreed to do the exchange of the voucher at Dischem. On 26th of September I tried purchasing diapers online and it showed invalid. I phoned dischem and I was told it can only be exchanged in store. Saturday 28 September I went to Canal walk Dischem and to my embarrassment it was also invalid. I emailed pampers and the lady said it was used online and the issue is with dischem. Dischem mentioned that they can't find my voucher number anywhere that I used. Now I'm sitting with a shortage of diapers because of lack of funds. I had to buy extra diapers because of the malfunction on pampers diapers. Everyone is complaining about the pampers active baby and nobody is doing anything about it. The box of pampers premium is 350 if it's on special. The least pampers can do is not make as if we are lying when their vouchers they give "out of good faith" is not working