non payment for services rendered

Good day,my husband did transport for hearland cereals in january this year and up until now he hasn't received his full payment.They are a multi million rand company that's supplys almost all the large supermarkets in pmb.Time for payment they claim they have no funds in their account.My husband calls and emails them every single day for his money and up until now they haven't paid him.How can they do that to hard working people,they wanted 2 have their goods transported,now the job is done they dnt want 2 pay