Debt collectors

I took a 2 year contract with vodacom from June 2014. I stopped working in Feb 2015. I contacted Vodacom and explained my situation to them, which was that I can no longer afford the contract and so I needed to downgrade to something I'll afford. Reply was that they can't assist if my account is up to date, that I have to wait until the account is overdue. They never did until few months later when I went to the local shop to arrange for settlement. Three days after Vodacom directly handed my account to debt collectors.<br> My problem is I gave my case to Vodacom before there were any issues with my account, they never contacted or done any follow up as they said it will happen, only after I have done arrangements to settle the account I started receiving smses and calls that my account is handed over.<br> <br> Vodacom should have given me options, only if failed any sort of arrangement with them should they take my account to debt collectors. I have settled the amount I got from Vodacom accounts consultant, but now debt collectors I demanding other money from me which I don't think I'm supposed to pay.