Poor service.. money selfish

I have contacted Vodacom advising them That I have no funds to pay my installments. If I can send the phones back and close my account they refused. I paid every month. but due to circumstances I had to relocate now not earning that much I asked them to help me they refused last month and this month I cant pay bcus if I pay I can't eat. I have cried and begged either they drop the call or tell me no u have to pay or legal actions will be taken