Binaryclues is one database provider company which starts its package services at INR 1500 for 50 K emails. They have bigger packages also . You can choose the appropriate package as per your needs.
If you a have valid email opt in list then you can use easy sendy pro or binaryclues Indian bulk emailing database software which helps you send min. 100k emails a day.
Just make sure the email I'd you have are correct otherwise you domain might get blacklisted. I will share a competitive chart below which will help you take a faster decision.
If the information was helpful, please let me know your response. I will try to assist you to my level best as I have used both of them and both are very good tools for sending millions of emails.
Binary Clues provides Database services around the globe and also provide the accurete and useful B2B Bangaluru email database services.
Else you can send your query to them at info@binaryclues.com