"I'm sorry that you're being bombarded with comments, I hope your phone isn't getting affected!"
(Using XX for his name as an example)
=> XX 씨가 댓글들 너무 많이 받게 돼서 [죄송해요/안됐네요]. 전화(에)는 영향 없길 바라요.
=> ...댓글 폭탄을 받게 돼서... (댓글 폭탄: comments coming like a bomb, bombardment)
=> ...댓글에 치이게 돼서... (치이다: to be overrun by a car, work, etc)
* If you caused it yourself, 죄송해요(apologizing), otherwise 안됐네요("too bad").
(죄송해요 and 미안해요 are only used when you appologize)