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In short, I have not received my refund in the promised 15 business days period, and based on the previous experience with Dell customer service at the call center, I know they won't be helpful this time either. Timeline:  May 27th: product delivered  May 28th: installed and couldn't get it work properly  May 29th: realized that the product is incompatible with my chip, initialed a return   May 31st: Fedex pickup, marked return # and purchase # on the package as requested  June 2nd: delivered and signed  June 3rd: Dell portal still indicates "awaiting shipment," so I got concerned and contacted the customer service as I never received any pickup notification from Dell June 3rd: was confirmed on email by a representative that is has been received, told me to expect it in 10-15 business days  June 22nd: Dell portal does not reflect any updates on the return, let alone refund, neither is my bank. Called and reached a customer representative who did nothing but reassured me "I will escalate the issue" and explained nothing about the case. Even less helpful than the last time but spent time on phone to make me give him my word that if I received a survey, I will give favorable ratings.  June 23rd: It might have been escalated from Service 3 to ... something, but nevertheless, I was email reached out by someone saying that he will take care of it from now on, but still no information or updates whatsoever. Took them 26 hours to...not figure it out. At this point I just don't think it's worthy of my time and energy, and I am so glad I used a credit card when purchasing, If this does not resolve by itself in another month, it seems that I don't have a choice. 
Terrible Refund Experience