Incompetence

I have been a client of cell for over 6 years but the service leaves much to admire. I changed employment and I called to notify that my debit order date need to change which I was told it will only change 31 days from now. I accepted. The debit order ran needless to say there no funds, I then Made a payment to them on the third of August and send the proof of payment to them. Prior to this I noticed that there large sums of debits being debit for 7 contracts but I only have 4 contracts with them and I was told that I must go to the police station to make an affidavit(bearing in my mind I just started at my new Job) the consultant had an attitude and couldn't care why I am frustrated. Although I have asked for a debit order change, I was still debited on the previous debit or date than what I asked to be changed and this time a double debit on all my accounts of a large sum of money. I need clarity as to why did this occur,where is the notification of this and why was the amount paid for previously not allocated?where is my money and these 3 additional contracts not canceled?? I await your response if any at this point I want to cancel my business with you.