My graduate program advisor/manager (one, who manages logistics of students; not for thesis) and I had arguments about how he proceeded the work (e.g. dropping my course without notice by self-speculation that my workloads are not achievable). Thus, I had arguments with my graduate program advisor/manager and resolved it during a face-to-face meeting.
Afterwards, I had a problem with working with him. He does not provide right information to my inquiry on a visa and has been ignoring my email inquires on a visa for over 3 months.
Following the advice from @Buffy, I involved my advisor to report the department and addressed this issue.