Maruti Suzuki — Mechanic cheated me

Address:

Bangalore, Karnataka

Dear Sir/Mam,

One week back i gave my car for service to the local Bangalore car garage. During the examination of the car the mechanic told me which problems the car had and how much the repair would cost. On the second day of servicing the car i gave to the mechanic 20 thousand rupees (which was 7 thousand rupees more, than discussed the first day) for the purchased spare parts. The third day he called me again and told, that he needs another almost 20 thousand for purchasing the remaining parts. I gave him only 10 thousand and 6 remained in balance. On the final day of servicing i came to take my car and also asked for the bills for all the spare parts bought. And i got some funny fake papers with no stamp or signature with some awkward prices. I refused to pay the remaining amount. With the bill i went to another shop and asked what is the original price of these parts. To my complete surprise that mechanic decided to charge me twice more than the actual price of all the spare parts and mechanic's work all together. I demanded for the original bills and got some silly excuses. Moreover, not all the work that he promised to do was done. Door connection is not fixed, AC is not fixed at all. The owner of the garage also refuses to solve the problem and return the money. Please advise on how i can return the overpaid amount.
Feel awful and angry after being cheated so meanly.
Please, help.

Thank you,
Irina