No.
You don't need a CRM.
Why
Four channels and three people is the actual problem — not volume. At 10–50 inquiries/month, a proper CRM is overkill, but the four-channel split means a lead can hit Instagram on Monday, WhatsApp on Wednesday, and nobody on your team knows it's the same person. You're an agency selling Meta ads to people who DM you on Meta — your "pipeline" is mostly conversation threads, not deal stages.
Why this matters for you specifically: ads agencies live or die on response speed. A lead asking "how much for Meta ads management" who waits 6 hours has already DM'd two competitors.
What you actually need
- Respond.io or Trengo (starts ~$79/mo) — unified inbox that pulls WhatsApp Business, Instagram DM, and web form into one view with assignment to a teammate. LinkedIn stays manual, but that's fine — it's the lowest-volume channel for you.
- A shared Google Sheet "Inquiries 2026" — columns: Date / Name / Channel / Company / Ad spend budget / Owner / Next action / Status. One row per qualified inquiry only (not every "hi"). This is your pipeline.
- A habit — the 10am + 4pm sweep — twice a day, all 2–3 of you check the unified inbox, claim unassigned threads, and update the sheet for anything that became a real opportunity.
Do this today
Sign up for Respond.io's free trial at respond.io, connect your WhatsApp Business number and your Instagram business account through their channel setup, and invite your 2 teammates. Then in Settings → Users → Assignment, set round-robin so every new conversation auto-assigns to one of you. By tonight no inquiry across WhatsApp or Instagram is "everyone's job and therefore nobody's".
What to ignore
Skip HubSpot Sales Hub Starter ($20/seat/mo that balloons fast), Pipedrive, and especially anything pitching itself as "the CRM for agencies" (Bonsai, HighLevel resold by other agencies). At your volume and team size, a deal-stage CRM is a solution looking for a problem — you don't have 200 deals in flight, you have ~30 conversations that need answering today. Also ignore anyone selling you Apollo or lead-enrichment tools; you're inbound, not outbound.
What doing nothing costs you
A conservative 20% slippage on 30 inquiries/month (mid of your 10–50 range) across four uncoordinated channels = ~6 lost leads/month. At a ₹25,000–50,000/mo Meta ads retainer with even a 6-month average tenure, that's roughly ₹10–20 lakh/year of retainers walking to faster-replying competitors.
When to revisit this
When you cross 50 inquiries/month consistently, or hire a fourth person — then move to Zoho Bigin or Pipedrive with a real pipeline.