Sally -
Have you Logitech Support? They have phone, chat and forums support here:
https://support.logi.com/hc/en-us
It comes with a one year warranty during which they must get it working or replace it. This warranty falls on the manufacturer and not the store unless you buy their own warranty which is usually extra. Sometimes if you speak with the Store manager they will try to make it right as a courtesy to keep the customer.
Feel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.
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