Bulk Messaging Setup & Guidance

I have a database of roughly 100,000 users with mobile number and I need a reliable, cost-efficient way to blast promotional offers to them. I’m open to several channels—DLT-approved SMS in India, non-DLT... (Budget: ₹1500 - ₹12500 INR, Jobs: Compliance, Content Marketing, Digital Marketing, Email Marketing, Facebook Marketing, Internet Marketing, Lead Generation, Marketing Strategy, Sales, Twitter)