Issue with EP T21

Hi,
on Jan 2020 i purchased EP T21 headphones. They worked great with my Iphone X till March and then i couldn’t hear any incoming call, people can hear me but i can’t hear them.
I can still listen to music but that’s it.
Any ideas?
I need them go back working again with Iphone calls!

Enrico

Please contact our service team at support@aukey.com.

Hi Kelly, I have followed your suggestions many times but unfortunately it didn’t work. May I get a replacement?
Enrico