Vat Refund Agency

This is the most horible service in South Africa. They dont pay up, ignore our messages. I have emailed, called and sent whatsapp mesaages and texts but they dont respond. They simply blue tick and ignore. I filed for a claim last year July and till now after a year plus they havent paid up. They received our money from Sars a long time back and we even sent them our banking details but still they simply ignored. I dont know what to do anymore. This service looks like a **** and ran by *******.