Arv Holidays Private Limited - amount not reimburse

Tour place: singapore dated ** mar, **** to ** mar, ****
Package requested: * adults & * children (* with bed & * without bed + with dinner with flight) (Refer attachment-*)
Amount paid: *, **, ***/-
Package provided: * adults & * children (Without bed + without dinner) (Refer attachment-*)
Actual amount: *, **, ***/-
Amount to reimburse: **, ***/-
Refer attachment-* for all correspondence have been done with mr. Arun sharma (Founder), where he just kept promising to reimburse the amount. Now, in last few emails, he has stopped responding also. More than * months have been passed to this issue without getting any money from him.
This is really wondering after accepting for reimbursement, why does arv holidays not pay the amount? It is the mistake of arv holidays, though they treats this matter in very irresponsible way.