Finchoice refuse to remove a unused unwanted debit mandate order

Application for loan was rejected nearly 3 weeks after application was done. They put a debit order mandate on my bank account. Now they refuse to remove it. Keep on getting "reinsurance " emails stating that they just keep it there for future use. I dont want to do business with them, not now, never! Still they refuse to remove it. I also all off a sudden have a funeral policy thatI don't know where that came from. I merely just fill in a loan application that was declined not a funeral policy. I don't want a un unused debit mandate on my bank account! I simply don't trust them.