The down could be damaged. In this case returning it for a refill, or doing it yourself, might be needed. A couple ounces of fresh 800Fill down will do it. Devide the down into equal portions for each baffle you have. Put in a handfull, use a "destitcher" or stitch puller at the zipper, and put in that amount and stitch it closed carefully...down proof stitched. Too many stitches will weaken the fabric shell. Too few will not be down proof. Basically, a messy job and you WILL be picking up down feathers for a month of Sundays.
I would recommend washing with a good down cleaner, first. Likely 2 washings followed by a couple rinse cycles between. INSURE that no detergent or residue have been left in the machine! Stronger detergents will ruin the down causing clumping and failure. Then dry it for a several hours with some tennis balls.
I recommend every 7 days to throw it in the dryer and fluff it. Every 30 days wash it (with about half the amount of down wash recomended,) followed by an extra wash cycle (no soap) as a rinse...sometimes two rinses. Dirt, body oils etc. will cause feathers to "stick" together. Soo, they may tear and rip, leading to clumping and tangeling into mats. Keep the bag clean for longest life.
Assuming the shell is good, down can withstand any heat the shell can. The highest heat without harming the shell (around 140-150F) is the best for drying.
You *should* wear long johns in it to prevent body oils from building up too badly.
My 2 cents...