Poor Service. Empty promises

I purchased a 10kg cake flour three weeks ago and found a whole ecosystem of weevils living in the packet. This included worms. I sent pictures and videos as required to them on the 2 June and to date despite two follow up calls to them, still no response. I was promised a replacement voucher on Monday, 9 June will be sent via sms. Still nothing. I called today and was advised that a sms generated today(FRIDAY) should reach me by MONDAY. Clearly our telecommunication infrastructure is not world class that a sms takes three days to be delivered. I was forced to purchase a 2,5kg packet as i require the product for the weekend.