Vodacom doesn't care that I'm not working

I notified Vodacom that I am not working and thus unable to pay my account because my savings have been depleted. They sent me a letter stating that I have 7 days to pay my account. I am struggling to understand this logic and complete lack of understanding of my circumstances. I think I may even have about less than 6 months left on my contract. What a sad time I've had with Vodacom... now I'm just waiting for embarrassing calls to my family members, like they did before.