I have a Brother Sewing/embroidery machine that is comparable to your Elegante. Your dealer is full of xxxx. I use what they call the Off brand thread. I love, love, love the thread sets from Ebay. It gives you wonderful color choices at a very reasonable price. For colors I use a lot of, I order the large cones of polyester thread from Thread Art when they are on sale which they are right now.
https://www.threadart.com/category/4...rs-5000-meters I will tell you that you have to have a thread stand for the cones, but at the price, you can buy a thread stand for less than 15 dollars. Make sure that it is heavy on the bottom. The light weight ones just go everywhere.
https://www.createforless.com/Dritz-...901&cadevice=c Also, you may need some of the Thread nets because the thread will pool off.
https://www.amazon.com/Embroidery-Ma.../dp/B001U5A0Y0
I have Neverhad any of the "off brand thread" shred, fade or look bad. I have many friends with Babylock and Brother machines and they use anything they want to. The machines really don't care.