Customer service

Sorry, I didn’t explain. I purchased an hp computer that doesn’t work. I called hsn on a Thursday and was told they would send out a new battery and it could take up to 21 days. After almost 10 days of waiting I received a letter that they couldn’t resolve my problem. I called immediately after receiving the letter and they told me they needed the serial number of the computer. Who waits so long for this information? How did they not know to ask when I first called that Thursday? Now I have to wait another 21 days for a battery? Absolutely ridiculous. It should be shipped priority overnight at hsn’s expense