Double debit account

I place an order at the end or February 2015 for X amount. About a week later ,after the item was delivered,my account was debited for the correct amount. All well and good until 10 days later, [URL Removed] debits my account again. I emailed [URL Removed] as soon as i picked this up-I sent my bank statement,i also confirmed with my bank that there was a duplicate debit, only to have them tell me that there's no error. I tried calling [URL Removed] numerous times,but it seems the person i need to speak to is always on tea break or continues to change branches and never returns calls. The call center agents cannot help me as only the finance department can solve this issue, and it seems they also don't return calls. I'm still awaiting feedback up this day. This kind of service is pathetic. This is will be my last order with [URL Removed]