Contract cancelation

I logged a cancelation request with Cellc customer care agent on the 17 November 2023 and was advised it will be canceled on the 17 December ,and specifically asked if the will be any payment (expecting to pay prorata ) agent said No...now I get notication that I owe u guys and cancelation was not done .

I called today and spoke to six agents all of the just hung up..can u please @cellc cancel my contract . And your customer service is badddd 👎