Do you think we should also pursue the postage cost, time, etc? thanks,

Hi, My partner went onto the Vanquis website to pay her payment (using their debit card payment page) and even though she only pressed 'Send' once, the payment was taken twice. A few phone calls and a few days later, one of the repayments was returned to her MINUS £5 'administration' Now, I'm no lawyer, but surely this is unjust? Is there a way to encourage them to refund that fee too? Thanks, Phill