Bank account debited even tho payment arrangement

On Friday 10 April, I was contacted by Lizette from Virgin active as my premiums are overdue. I made a payment arrangement with her that my account would NOT be debited again this month, but rather that a double debit would be taken at the start of May. On the 15 April, Virgin active attempted to debit my account, which then obviously caused a negative balance on my bank account-the very thing I wanted to avoid!<br> <br> Please pay the bank charges into my account, as it is due to your error and also CANCEL my membership with immediate effect!