Lumentum Operations Sr. Mechanical Engineer interview questions

Their job advertisement seemed interesting. So I submitted my resume. Got the phone interview one week later and invited for an onsite interview. Before the onsite interview, their HR told me that thery are going to cover the expense on the interview and sent me the reimbursement of expense form. After the onsite interview, I submitted reimbursement of expense form for the interview trip from Montreal to Ottawa of about CND $200. However, I have not received any reimbursement from them after three months or heard from them. I contacted their HR, just in case they forgot it or something else happened. No response at all.