Banking

I purchased 1voucher on the App and when I try to insert it it says it's invalid on the 19 of July. logged a call for assistance and got a reference that I will get feedback on the 25th of July till this day when I called on the 18 of August no one followed up on my query no feedback. How can we support local business when they can't help their customers so very disappointed. everyone that answers the service desk when I call can't even help. I asked for the Supervisor and they where not available. Mxm this is not a way to render services to customers.