I'm having serious battery issue

Hi, need some opinion. I’ve bought a fairphone 6 two months ago and on July 29 the battery stopped charging, I tried different charger but nothing worked. I was away from home and when I came back I’ve started the request for the repair and I’ve send the phone, in a couple of days they fixed it and everything was good. Now one month after I’m again away from home and the same issue showed up, I’m genually concern about this phone so right now I’ve sent an email to the help center asking for a refound because I can no longer trust this phone, even if I really liked the idea of this company. My question is, somebody had the same issue? What would you do in this situation?