Telkom has pathetic service

Im disappointed in Telkom for their pathetic service.. I took a contract with Telkom in June 2017.. Paid my contract without every single month without fail, i never used my sim card, as i misplaced it, paid for a contract which i never used the benefits of it. I was retrenched in March 2019, which i stopped paying for the contract, my contract ended in June 2019, i received a bill for R1700, was told that for every failed debit order you are charged R200 (How ridiculous). Telkom assumed that i wanted to continue with the contract by putting me on a month to month without calling me to confirm of i wanted to continue with my contract, it is not the customers responsibility! Telkom customer service can never call a customer when the customer doesn't have airtime to continue the call, i worked in a call centre customers can be called back no excuse. i refuse to pay that bill, the service is pathetic and i was not contacted to confirm my continuation of my contract.