not treating customer fairly: not happy and am very angry

Good day

Am not happy with Vodacom I took a contract with the last year 2019 around September the following month I realized that they did not debit but they debited from my old account FNB, I then called them to ask who gave them the account number which they have used to debit they advised that from their data based they have that account I then provided them with my Capitec account. They debited for 2 months then they stop I called again in December asked them why are they not debiting and it was a Friday later calling using *** the guy advised ne they as Vodacom stopped debiting however he will log a call to resolve the issue since I didn’t stop or reversed their debit order till the 6.03.2020 the guy from Vodacom demanded me to pay the r900 outstanding I told him I will not as I did not stop them from debiting as I need him to send me proof that they have been sending the debit order request and my bank is rejecting them. Noe today the sending threatening massages that they handing me over I need to pay the R5797.74 1 I need Vodacom to listed to the first call of sale and tell me if the negotiator asked for my banking details. 2 to listed to my second call I made to them providing them with my banking details *** 3 the call I made in December and the call I made in Jan to query the debit order. ***