Order Verification issues, concerns

Good morning

I purchased a desktop from Dell Australia online store with my credit card on Friday night. Receive order confirmation email, everything seemed fine. Then two very suspicious things happened.

#1

The next day, I received a call from "Dell order verification department" the agent spoke poor English with a thick Indian accent. She claimed to need to verify my details to confirm I was the credit card holder.

She went on to ask if I was a student, where I worked, what my landline number was ( I do not have one nor do I know many people who) and the name of the company I work for. I told her I fail to see how any of this information relates to my order or credit card. She said if I did not provide all the details she was asking she would have to cancel my order as she could not prove I was the cardholder. It got even more ridiculous as she started asking for my husbands name and work information when I told her the previous statement. 

Are you kidding me, what does my husband has to do with verifying my purchase!!!

I told her I was going to call Dell directly as this seems extremely sketchy. She then told me that if I did not provide the details she asked the order would be cancelled unless I pay with bank transfer and provide bank payment details. 

At that point, I hung up.

I call Dell and they did inform me I would be receiving a call to verify my order. When I asked what exactly is going to be asked of me the agent could not provide an answer.

How do you verify an order if none of the questions asked had anything to do with 1. my credit card and 2. my order details?

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#2

Later yesterday evening I received an email from Dell. I did a search and a few reported this as a possible email scam. I have not replied as of yet.

Again I fail to see how asking for me to reply from a student email or work email, which are obviously not the email used to create or place the order is verifying the order? 

Do people realize that not everyone is a student and that not all jobs provide you with a work email?

I need to know what to do or who to contact regarding these incidents.