Selling **** products

They Sell Educational toys for kids, purchased a Tablet for my daughter and it does not work at all. Never switched on from day 1 and i let them know immediately. They promised to call me and never did, now they refuse to refund me or allow me to send back their tablet. they delete my comments on Facebook when i ask them why they are not responding to my emails or WhatsApp messages, and they refuse to refund me for express delivery though they were late to deliver the product