PLEASE CANCEL MY CONTRACT!!!!

I cancelled my contract on 24 September 2020. I was told account would be on 30 days notice and 30 September would be the last date of debit date. To my surprise, another debit was processed end of October. I reversed the debit and called in to request that they cancel as i am not liable because they had to cancel the contract accordingly. Called in again on 14 Nov asking for my request to be expedited, the guy wanted to me to be on another notice of 30 because his colleague didnt do the job right during SEPTEMBER. PLEASE CANCEL THIS CONTRACT as we have to port the number and move benefits onto this number orgently!