contract cancelled but debit order still active

I took a contract for the router with Vodacom on 18th Feb, but later cancelled and informed Vodacom within the required window period. THE consultant (Taryn) whom I communicated with on Vodacom Chat online stated that it has been cancelled and will be collected within 14 days. I kept on phoning to remind her but she said I shouldn't worry as the delays are with the courier. The router was only collected on 13th Mar. In the meanwhile, Vodacom didn't stop to take debit order on my account for both Feb and Mar, and planning to take one for Apr as per statement received. I called them again and was told the contract was not cancelled, which is strange as I spoke to their consultant many times and confirmed the cancellation. THe router was also collected (I have proof). How come it was never cancelled. Logged another request on 02 Apr and spoke to a consultant who gave me a ref A1-X1PZ-PB037A saying they will call me to confirm. Until today no call from Vodacom except statement showing amount due.