先程、電話したけど繋がりませんでした。VISAの件とありますが、私は英会話がほとんどできないので、メールでお願いしたいのですが。よろしくお願い申し上げます。
I've tried to reach by phone but it wasn't successful. You were mentioning that it's regarding VISA, but I'm not good at conversation English so could you please email me? Thank you for your help in advance.