Online Billing Issue

Can you please sort out your online billing!!!!!!!!Every time I place an order online, I get billed twice - the funds are deducted twice from my account - sometimes resulting in my account going into the negative , I do not have an overdraft facility and I am therefore penalised by my bank for this . It isn't automatically rectified so I then phone in only to be told that I can expect the money to be refunded within 3 days??? this is totally unacceptable and has been going on for months now - everytime I do an online purchase. All you do is apologise and absolutely nothing changes !! get your act together Woolworths - you actually owe me money too cover my costs!