Bad service and Unauthorized order

I am very disappointed with the service. ive always had a debit order set on the 23rd of each month, I was debited on the 23r Feb 2020 then again on the 1 \march 2020. when I called to ask why, I was told that my debit order date was changed to the 1st of every month. I did not authorize that and do not understand why my debit order date was changed without my permission. I was then told by the old mutual consulate that I must go to the bank and revers the amount then call after a few days to request the date changed again. so now its my fault!!! and I must take my time of work to go sit at the bank and request the reversal !!!! who the hell authorised that date to be changed ????. this morning I called to set the date debit order date on the 23rd again and im now told that I have to wait till after the 1st because I have now missed premium (which is the reversal I did) I would not have missed any premium if my profile was left alone!!!!! now I must struggle to get the correction done like it my fault!!! I want to cancel this