Kurl-On — convenio mattress stitches coming out

Bought kurl on convenio mattress on 15-4-18 and within 8 months the stitches have started coming out. Warranty is 5 yrs.
Who is going to fix the stitches from kurl on company
Toll free no of kurl on is namesake and no one picks the calls on saturday n don't even call back
Have attached video of the stitches worn out
I need a feedback and arrange someone to get this done