Poor service from Milady accounts department

After buying goods from Milady in early December, I did not receive a statement. In January I phoned them and asked me to send my statement, which they did. They then had the cheek to charge me interest for late payment, and club fees, for which I have not subscribed to. I paid the full amount excluding the interest and club fees. I wrote a message on their web page to which they did not reply. I then sent them an e-mail, to which they have not rep****. I have since received a second statement, in which they have still charged me for the interest, and again for a club fee. They do not respond to electronic communications