About Dell Order Verification department.

I booked a Alienware17 laptop online on 15th July with a international credit card. After I found I could not use an international credit card, I called them last day to change my payment methods to a local debit card. After my money was already taken, I received an e-mail saying like 

Please contact Dell at 1-800 571 3355 Ext XXXXXXX to provide additional information so we can complete your order.
Please note that failure to contact us within 1 business day may result in cancellation of your order. To expedite the handling of your call, please have your order number(s) (see below) when calling. We apologize for any inconvenience this additional security step may cause. Dell is committed to providing a safe and secure shopping experience for our customers. 

After I received this email, I called them like a thousand times and leave messages, but with nobody replying. Just half an hour ago, I received another email telling me to call another ext number but still nobody answer the phone. I really wonder what exactly happened, and I don't want my order to be cancelled cause I really need to use that laptop. Thx.