Billed while contract was terminated

Previously I bought Samsung A3 was happy with service until some I didn't want to use the number anymore i called telkom and cancelled the suspend the service, I went to the branch in Alberton I took a new contract Samsung A3 I requested the lady to assist me cancelling the old contract, she gave me forms to fill and I provided forms back to her she thank me and I left

same in October the debit order went through i thought no its fine its a last one, wow November 2017, December 2017, and January 2018 still

I called in serveral time to get the matter sorted in fact every month but no telkom is just enjoying the money they are taking from me

I will budget and buy this contract out and will advise all of my family not to ever think about telkom