I believe I was issued a faulty phone in August 2019

I belive i was issued a faulty phone in august 2019. I am still on a cintract with you, however the phone sporadically freezes and then turns off and doesnt turn back on again unless i reboot it. It is an iphone 10, less than a year old. I cant ring customer services because I am currently in the UK due to coronavirus, but i would like some help with this issue.