Parko bricks and sand

After ordering and eft they promised to deliver 3 times. After that I did asked refund on it. They just send me screenshot of refund, but nothing shows in my account. After back and forth wahatsapps I do believe they blocked me now. No further communication from them. Also there phone doesn't ring if called. Just communication through wahatsapps and emails. My next step will be SAPD if it will help. They send invoices through BB building supplies. Please be carefull before supporting these people