If you have not notified your card provider and had the account closed and a new card issued, that's something you should do immediately.  The call had nothing to do with Dell and was a fraud that was spoofed to look like it came from Dell.  
Received a call from 512-723-0000 caller ID said Dell computers. I normally would not answer but just yesterday I got a fraud alert on one of my credit cards. There were a couple of charges over $1000 each that I did not make..one to dell. The caller said they had received a replacement order that was sent back and wanted me to confirm address to send invoice. I said I didn’t place any replacement order.. he went through he spill again.. I said I didn’t place any orders an was not giving him any information. He started again and I just hung up
Scam call