Billing for discontinued services

I have billed for dstv account services on the 02/05/2019 , however my contract was cancelled on 2017.Premuims was deducted via debited order from my bank account without consulting with me or any permission passed by me...this feels like theft as I am not subsubscribed to their services...their assistance cannot provide suitable answers as how funds where removed and when reimbur*****t will be transferred...who fits the bill for the extra cost for bank charges ,phone calls,time etc...this is highly disappointing.