Duplicate debit order - no response

I sent them an offline message a little before the 3rd of July. On the 3rd of July, I sent them an email, as I had not received a response. They only got back to me on the 24th ( yes the 24th) claiming they cannot find my account( Please note that I have continuously received my books - on time and that is the only thing going for them at the moment)- Anyway, back to my complaint. They asked that I send them more detail, gave a list and asked that I send one of them. I decided to send the delivery address as that is the easiest as I do not know what the subscriber number is or where I can get it. 3 Hours after I sent them my delivery address, they asked for the address again? – I mean really? I just gave it again as I want this sorted out. I work according to a tight budget. They also asked for my subscriber number. I told them I do not know my subscriber number, and asked them where I can get the number. – To which I have yet to receive a reply. I send them a snip from my bank statement showing the duplicate deduction – made on the same day. I mean how the hell do you manage that.

Anyway by the 27th July I have yet to receive a response. I emailed management, and still nothing on the 30th.

I thought my email did not go through so I emailed again giving an extension until 31st July.

It is now 1st August and still no response.