Charged for numbers which I ported

In December my daughters and my cell phone contract was due for upgrade we went to Vodaworld and Vodacom was running a special. I popped into the Altech Autopage store and advised them I was porting my numbers. I then went and took out 2 contracts at Vodacom on my line and my daughters line. I came home and called Autopage to advise them that I was porting my numbers and did I need to send them anything, they advised that since my contract was over and that I was not moving over to prepaid I didn't need to send them a letter. In January I received an email bill from Autopage charging me for the line rental for Feb and when I called them they advised the lines are still active on their network. My daughter even received a new sim card. we were never credited with the airtime and data and they have debited my account with the money. I called them again and spoke to Themba and he gave me 2 references one for the cancellation of the lines and one for the refund (***) my question is why did they not cancel the lines once the port went through? how can a cell phone number be active on 2 different networks. this is unacceptable and I want them to refund me immediately!