Vodacom gets RICH from taking from the POOR

My contract came to an end in Dec 2017 for a mobile router that broke after a few months of actually working thereafter I paid for something I could never use. However when my contact ended MY DEBIT ORDER continued thereafter to date which is now 7 months later July 2018. Despite me making countless attempts of contacting Vodacom and trying to get them to stop the incorrect debit order and to refund me. They keep making promises that it is cancelled and I can expect a refund in 14 -21 working days. In the meantime when that 14-21 working days passes its month end and yet another debit order goes off my account. A contract comes to an end then it is finished unless you do another contract. Vodacom is such a big company who is *****ING from me every month when Im struggling each month to make ends meet. With the high water bills and petrol and school fees and the list goes on and on. This GIANT of a company thinks nothing of *****ing and taking from every month for a service that has ended 7 months ago.