New earbuds squealing for other callers

Just got these earlier this week. No issues the first two days but every time I’ve been on a call today, the other person complains about my phone squealing. I’ve tried restarting my iPhone, forgetting the Bluetooth device then reconnecting. Still having the issue. Anything I can do other than sending them back and getting a new pair?

There’s no issues for me, just the other person on the call.