1. I would like to file a complaint as you all suggested for unfair services (hiding from customers)
2. What will be the consequences, once I will file the complaint against them.
You should file the criminal complaint against the fake vendors for fraud and cheating offences.
You will come to know the consequences later on.
3. I know only marketing person who left the job, do not know about company directors, should i include his name as only he picks up the phone but no use.
You can include in your complaint whoever was in direct contact with you and also make the owner responsible for this.
4. Is it possibility of spend more money to get compensation or final letter from company.
What money and why do you spend?
5. Should I warn them first through SMS as they are not picking my phone and then file the complaint or direct file the complaint against them.
No use of warning them, lodge a complaint with the police first.
6. Should I go to nearest police thana or go to specific place ..plz Suggest
The police station shall be where the property situate.