My sleeping bad does not work properly ?

My wife and I have gone camping in the mountains for Christmas, I bought the following sleeping bag... https://www.walmart.com/ip/Coleman-Dunnock-Big-and-Tall-20-to-40-Degree-Adult-Sleeping-Bag/15840148 The problem is the first night here temperatures fell down to 19 degrees, we had to get out of the tent and... show more My wife and I have gone camping in the mountains for Christmas, I bought the following sleeping bag...


https://www.walmart.com/ip/Coleman-Dunnock-Big-and-Tall-20-to-40-Degree-Adult-Sleeping-Bag/15840148


The problem is the first night here temperatures fell down to 19 degrees, we had to get out of the tent and sleep in the car. Nearest Wal-Mart or Target is approximately 150 miles away, I am considering driving the 20 miles to shop see what they have even though I know it will be pricey.
Update: I guess need to buy another bag to lay under us and add another so two op top of us. Any thought, suggestions would be greatly appreciated.
Update 2: I did not know had to spend $300.00 more on a sleeping bag. For that kind of money the darn thing should make me breakfast.
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