Excess onsite allowance credited issue. Need advice.

My first short term travel was cancelled but funds got loaded into my travel card for 60 days. After a few weeks initiated travel again for 35 days. No funds credited this time. But utilized the funds in my travel card to meet my expenses onsite. Utilised only 35 days' funds. Kept the remaining in the card. After returning to offshore, 35 days onsite salary converted into Indian rupees got credited to my salary account. Connected with the finance team multiple times, sent several emails and raised tickets, they promised to initiate recovery through payroll, but I am still receiving my salary even two months after intimation. What should I do in this case ?