Why

You listed WhatsApp, Email, Instagram DM, Phone calls, Walk-ins, and LinkedIn — that's six surfaces for at most 50 inquiries, meaning some channels probably see 2-3 messages a week and get checked once a fortnight. With 2–3 people, there's no clear rule for who answers what, so things drop between the cracks of "I thought you got it." A CRM won't fix that; it'll just become a seventh place to forget to check. You need one funnel point and one owner per channel before any tool earns its keep.

What you actually need

1. Google Sheets (free) — one sheet, columns: Date / Name / Channel / What they asked / Owner / Next action / Status. Every inquiry from all six channels lands here within the hour it arrives.
2. WhatsApp Business labels (free) — since WhatsApp is probably your noisiest channel, set up "New", "Replied", "Awaiting answer", "Closed". Takes 2 minutes.
3. A habit — channel ownership + 9am sweep — assign each of the six channels to ONE named person (e.g. WhatsApp + Phone = you, Email + LinkedIn = teammate A, Instagram + Walk-ins = teammate B). Every morning, each owner sweeps their channels and logs new inquiries in the sheet.

Do this today

Open Google Sheets, create a file called "Inquiries 2026" with columns Date / Name / Channel / What / Owner / Next action / Status, and share edit access with your 2 teammates. Then in a 10-minute huddle, write each of your six channels on a whiteboard and put one person's name next to each — no channel gets two names, no person gets zero. By tomorrow morning every inquiry has a single human responsible for it.

What to ignore

Skip HubSpot Sales Hub, Salesforce, and any "omnichannel inbox" pitch from Respond.io or Freshsales Suite — at 10–50 inquiries/month with a 3-person team, you'd spend more time configuring integrations than answering customers. Anyone selling you a $50/seat/mo unified inbox is solving a 500-inquiry problem you don't have.

What doing nothing costs you

With six unowned channels and inquiries scattered across personal phones, DMs, and walk-in memory, you're almost certainly losing 20%+ of the 10–50/month — call it 5-10 inquiries — simply because nobody knew it was theirs to answer. The compounding cost is reputational: people who got ghosted on Instagram don't email you to complain, they just go quiet.

When to revisit this

When your sheet crosses 200 rows or you find two people replied to the same inquiry in different channels.