Wantitall - they want all our money, but dont care if we getitall from a customer service perspective

I accidentially entered an incorrect quantity on my Wantitall order yesterday, of 2 instead of 1, I immediate noticed when their emailed invoice came through, so I emailed them urgently to advise i need to correct my order, I then also called them. Their lacklustre response was email us (I already did) and we will advise someone to contact you to make the amendment. Naturally they debited my account immediately, but the support required to correct the incorrect expense, is not forthcoming. Truly disappointed, wont be using them again anytime soon.