Looking for free CRM software with WhatsApp integration

So we're a Small Retail sales Startup based in India. We deal with 5-10 Walkins/day. Initially we created an Google sheet and Inputted all the customer data to follow up. but over time it added up and it's hard gliding through pile of data, filtering it out updating contacts, Following up leads on WhatsApp.

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Kindly suggest a CRM software in which we can Integrate our Whatsapp Business Account to follow up and keep track of our customers easily.