Fradulent charges - need to provide verification to credit card company

We recently had 9 fraudulent charges made on our company credit card with Dell Business Online @ Round Rock Texas.

We need to find a way to verify with Dell that our company did not indeed place ANY orders with the credit card for the amounts charged. Or had ANY shipments made to our offices for these 9 fraudulent charges. We would like to be contacted or find a way to verify our accounts for this. There is NO phone number to call for Customer Service.