Excitel — Regarding Security Refund

I had submitted my router to excitel partner for which I deposited 2000 rupees and they communicated that the security will be returned within 90 days after returning the router.
However, I have received only half security deposit (i.e. 1000) and half security is pending since long. The router was submitted in December'2022 but they always said that their team is working on the matter.

Please look into this.