EB T27 won't work together

Hi there,
Yesterday I got my new wireless Headphones and after charging them fully the set up was really easy and they worked nice! But since today the won’t pair!
My phone finds them both, but I can just hear with the left one Or the right one!

I tried all Tipps given in the manual and what I could find online, but nothing won’t help. I am. Willing to try a little more, but I am close to returning them.

Greets

So nobody cares, I will send them back and leave bad feedback on product and service