Maruti Suzuki India — Regarding return of my extra money, paid during purchasing

Address:

Patna, Bihar, 800001

Dear maruti team, i purchased ciaz vxi+ on 12th july from vaise automobile, patna, bihar, during the payment process i paid some amount by cheque, some by loan.in final bill i paid 15000 more then the actual price. I asked for return at that time but they told me that it will be returned to u within week by cheque not by cash or u can buy some accessories, but i asked for money. They said ok sir it wl b return within week. But even after multiple reminder by my side, till now i couldn't get my due back. Kind take this matter seriously and di the needful other wise i don't have any options other there consumer form.