From my point of view, this can be due to a garment made from a short fiber/yarn...I’ve messaged them, I’ll see what they say.
Could it be due to the jacket I wear? I usually wear it with a windbreaker(since I walk) with a polyester lining.
Let us know what they have to say...but i expect something like "its normal for the garment to pill in the beginning etc etc" I hope you explain to them all what happened