Not responding to messages via Messenger - Consumer Complaint for Shakeys

I sent a message thru messenger that I am planning to place an order. Someone called but because I was away, I was not able to answer it so I texted back saying if they can call me back again. No response. I checked my messenger and they said that they tried to call me but no luck and was askinh for an alternative number where they can reach me, after I responded and kept on responding but it's always seen zone.I am a customer trying to buy your food but it seems you do not want to have business with us. It's clearly a very poor customer service.