Obaro wonderboom and Voermol feeds refused to refund

I bought a primix 450(cattle feed) from Obaro wonderboom and after feeding 2 of my cattle the all die,I took it back to Obaro wonderboom were I meet Mr Malan from voermol which is the supplier,he took the sample and I took the sample also from the bag to the laboratory and the laboratory found glass particles in the feed but Obaro wonderboom didn't even bother to talk to me or even reply my email and also Voermol feeds told me that I cannot get any refund from them