Global Agencies (often with remote teams or ability to serve Bangladesh)

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Belkins Inc.: A lead generation agency specializing in high-quality leads across many industries. Strong for B2B.
CIENCE Technologies: Uses human research and AI-powered tools for B2B lead generation, with a focus on outbound sales.
Callbox Inc.: Utilizes an account-based marketing (ABM) approach across multiple channels for lead generation.
Martal Group: A demand-generation sales partner that helps B2B tech companies find leads, offering both inbound and outbound sales services.
Pearl Lemon Leads: Offers fully outsourced B2B lead generation campaigns.

SalesRoads: Assists clients at every stage georgia cell phone number data of the sales funnel, with a promise for quick results.
Cleverly: Offers various lead generation solutions, from cold email to LinkedIn marketing and profile optimization, primarily B2B focused.
Calling Agency: Provides B2B & B2C lead generation services including telemarketing, appointment setting, and multi-channel targeting. They mention working with "Solar leads" as an industry.
B. Data & Prospecting Platforms (Often used by agencies or your internal team):

ZoomInfo / Lusha / RocketReach: These provide extensive B2B contact and company data, useful for building targeted lists for outbound efforts. (You would need to verify their data coverage in Bangladesh).
LinkedIn Sales Navigator: Essential for B2B prospecting, allowing you to identify decision-makers and build targeted lead lists on the LinkedIn platform.
C. Agencies with a presence or focus on Bangladesh:

SkyTech Solutions (Dhaka, Bangladesh): Has over a decade of experience in BPO services, including telemarketing and lead generation. They explicitly mention "Solar Leads" as one of their specializations and offer both B2B and B2C lead generation services via telemarketing.