MBD Shabby treatment

Since last year I have been communicating with MBD who only want to deal with me telephonically, harassing me for a old account. Continuous emails to various consultants have either not been answered, ignored or a generic letter apologising for the delay etc. I ask in all these communications the original statements of this old account in its entirety which 6 months later I am still waiting for. From being harassed every day to silence is shabby treatment. It seems to me that this company is only interested in telephonic conversations with attitude and refuse to discuss anything via email. Why is that? I have had the same contact details for 15 years and have always been transparent, please remember Customers have rights too.