VODACOM BLACKLISTS CUSTOMER?

I recently resigned from work to be a full time mom. I thus no longer earn a salary so changed my Vodacom debit order details so that the monthly fees come off my husband's account. When changing the debit order details and account into my husbands name, Vodacom Hillcrest closed my previous account. Nothing was mentioned about any amount being outstanding. The debit order has been coming off my husbands account for months now. A few weeks back I received a call from a person who says they are from Vodacom and wanted my details and wouldn't tell my why. They were extremely rude. Needless to say I didn't disclose any of my details. I received another call today, also seeming to be a ****, I again didn't provide my details but followed up with Vodacom. They now tell me I am blacklisted and it has been handed over to debt collectors. Horrified that I would be blacklisted I followed up with the debt collectors but they are extremely abusive and wont explain to me how I can resolve this. I just find this unacceptable service from Vodacom. No written warning via email or post, just a call from a stranger who cant really speak English asking for my details. Now I am blacklisted?!