Chat customer service 24/7 for Webpage and Whatsapp

We are need a new freelancer this do chat customer service for our companys and departments 24/7 for our webpage and whatsapp if coming a buyer or seller to us. The reply answer to answer the people and this need to answer is 5 minutes. its coming appromixatelly 50-100 contacts in the month. hoppe to start a longterm cooperation and wish you happy new year. stay good health :-)