Very Poor Customer Service

Good day. Can you please help me with a complain against Telkom. I had a two year contra ct for a data internet router.The contract started Nov 2017 and was supposed to be up until Nov 2019.My account no was *** and service ref no ***. I went instore to Telkom branch at Wonderpark Shopping Mall during September 2019 to warn them in time that after the period I dont want my contract to go on and I received a ref no instore from the lady who did everything on the computer. Ref no was ***4 My last debit order went through in December 2019. On the 9th of January 2020 I had to phone Telkom again and I was informed that they never responded on that first ref no and the contract was'nt cancelled so another ref no was given to me Ref no ***3 Needless to say nothing was done and up until the 6th of February I had to phone them the 3rd time just to get another ref no ***7 In the meantime,Telkom still send messages through to the Bank so that my debit order should run.My monthly debit order amount was R455.00 and now I re eived messages from my bank that there was so sufficient funds in my account Suddenly my debit order outstanding is R1586.00 because NO one is capable to stop an account that was signed for only 2 years. I had it with this useless guys Keep on telling me over the phone that the contract wasnt cancelled And they cost me over 450.00 on banking fees extra. I really dont know how to get through to these people They stole money from me now How can a contract for 2 years just been extended after cancellation.I signed up for only 2 years.