Distasteful and Loathing Service

I am an existing customer of this bank for many years now but the kind of treatment i am getting is absolutely poooooor and frustrating, I have multiple accounts with them and I have been paying very well just the one month the debit orders did not go through and I explained very well what happened because the following month after that debit orders have been going through as normal but recently i was told to pay the arrears as per their instruction I did go make cash payments at the nearest branch if my memory serves me well it was the 11th of September 2023 to get the accounts up to date, the following day the put both accounts that were paid to date on term extension or term extender because apparently they are still owing I went again the end of September to pay another installment plus the monthly installments, so on the 5th of October i logged a complaint for the term extension to be removed on my name because i did not even approve or no one discussed them with i was told the turn around time is 7 working days up to this day i am still waiting for feedback 31 working days later and in between i got a call stating that they are going to cancel the term extension on the one and then the other one if they cancel the term extension there is going to be arrears will i be able to pay them i said yes and they sent me an sms stating i have a certain amount arrears again which i went and paid on the 16th of November at the branch again, i have been calling to follow up since last week i keep on being told the matter is escalated they will call me back, no one does i am the one following up the whole flippin time its as if my complaint is not good enough for them. I am not getting the service i deserve as a long serving customer of this bank. I am frustrated to the core i wish i never opened accounts with them ever.