MBD misleading clients into signing a debit order with no email support

MBD refuse to communicate with clients via email, no matter how much a client also needs something in writing and not just a call recorded on MBD's side, if MBD gets hold of a client they just keep pushing ahead for the client to agree to their demands - telephonically. Secondly, nowhere do they say the word "debit order" but essentially that is what the client is are signing up for, so there is no option to pay the amount into a bank account before the set date. The conversation is a one way battle, no matter how hard the client tries to be kind and polite and ask for communication via email, MBD only pushes ahead to get all the boxes ticked.