Clients are not taken seriously

I have been getting monthly calls reminding me to pay my account which I have been doing until I asked for a statement, the call centre agent said he would request one or me and that I would receive it in a week's time. What they call a breakdown statement was rather a summary of a statement it showed a total of payments, interest and balance owed to date. I rep**** to the email that I need a real statement showing the amount I owed when my account was handed over to them, dates and amounts of when interests were added and when payments made. This process started on the 3rd June instead of a reply to my email MBD stopped so I started calling them with the call centre referring me to Customer Care who make me hold for a while and then hang up my calls repeatedly. I held back payments this month and the next thing they are calling me on the office phone which I have never given them and to two agents I told them I am not going to speak anything to them until I am sent a proper statement. Today I send an email on their enquiries email address that I found on the letter they emailed me about my missed payment and I logged into their website which I never knew existed until today, I filled in their contact form and none were rep****. This afternoon again another call from MBD on the work phone I told them I do not know the person they looking for so they ask for HR. It is utter ******* that they now want to discuss my personal issues with my employer as if I am not paying my account just because they do not want to give me what is due to me. I cannot keep making payments while they add nonsensical interests that they cannot even explain.